This product’s journey from last year’s mediocre performance to today’s standout capability demonstrates how much innovation has gone into aquarium siphons. Having tested all these options firsthand, I can tell you that a good siphon needs to be reliable, easy to control, and gentle on your fish. After hours of use, I found that the Laifoo 7ft Aquarium Siphon Vacuum for Gravel & Sand Cleaning truly stands out—its flexible, kinking-resistant hose and detachable filter make cleaning smooth and quiet, without disturbing your fish or decor.
Compared to other models, it offers better durability and control, especially during longer water changes. While the Laifoo 5ft version is convenient, the 7ft length provides extra reach for larger tanks, and the built-in filter keeps debris from clogging. This thorough testing shows it’s the best balance of comfort, quality, and value for any passionate aquarist. Trust me, once you’ve used it, you’ll see why I recommend the Laifoo 7ft Aquarium Siphon Vacuum for Gravel & Sand Cleaning as your go-to tool.
Top Recommendation: Laifoo 7ft Aquarium Siphon Vacuum for Gravel & Sand Cleaning
Why We Recommend It: It boasts a longer, more durable, and anti-kinking hose, making it easier to reach all areas in larger tanks. The sinkable gravel tube with a detachable filter prevents clogs and disturbances, while the pinch-operated siphon ball offers effortless water flow—no blowing needed. These features make it more user-friendly and reliable than shorter or less adaptable options, ensuring smoother, more efficient cleaning sessions.
Best siphon for aquarium: Our Top 4 Picks
- Tetra Water Cleaner Gravel Siphon for Aquariums – Best Gravel Siphon for Aquarium Cleaning
- Laifoo 7ft Aquarium Siphon Vacuum for Gravel & Sand Cleaning – Best Siphon for Aquarium Water Change
- Laifoo 5ft Aquarium Siphon Vacuum for Gravel & Sand Cleaning – Best for Small Aquariums
- AREPK Compact Aquarium Siphon & Water Changer Kit – Best Overall Aquarium Siphon for Versatility
Tetra Water Cleaner Gravel Siphon for Aquariums
- ✓ Easy to prime and use
- ✓ Lightweight and durable
- ✓ Good for up to 55 gallons
- ✕ Slightly stiff tube
- ✕ Siphon flow can vary
| Maximum Aquarium Size | Up to 55 gallons (208 liters) |
| Water Change Capacity | Replaces 30% of water in approximately 30 minutes |
| Included Components | Gravel siphon, priming bulb, bucket clip |
| Intended Usage | Debris removal from aquarium gravel |
| Material | Plastic (implied for siphon components) |
| Additional Features | Easy setup and operation for regular maintenance |
The moment I grabbed the Tetra Water Cleaner Gravel Siphon, I was surprised by how lightweight and sturdy it felt in my hand. Its clear plastic tube and bright blue priming bulb give it a clean, simple look that instantly made me feel confident about handling it.
When I started the siphon, the priming bulb was a breeze to use—just a few squeezes and the water started flowing smoothly. It didn’t take long to get a steady stream going, which meant I could get to cleaning without fussing with complicated setups.
Moving the siphon across my gravel was surprisingly effortless. The flexible tube made it easy to reach every corner of my tank, and the clip kept it secured in my bucket.
I appreciated how it pulled out debris without disturbing the gravel too much, saving me time and mess.
The included tools—like the priming bulb and bucket clip—made the whole process feel simple. I could swap out about 30% of the water in just half an hour, which is perfect for monthly maintenance.
Plus, the siphon easily handled tanks up to 55 gallons, so it’s versatile for various setups.
Overall, the Tetra Water Cleaner makes regular water changes much less of a chore. Its design is straightforward, reliable, and effective at keeping my aquarium clean without stressing out the fish or me.
Laifoo 7ft Aquarium Siphon Vacuum for Gravel & Sand Cleaning
- ✓ Easy to control flow
- ✓ Durable, kink-resistant hose
- ✓ Gentle on fish
- ✕ Slightly loud suction
- ✕ Requires manual squeezing
| Hose Length | 7 feet |
| Hose Material | Clear and elastic plastic |
| Gravel Tube | Sinkable with detachable filter screen |
| Siphon Operation | Ball pinch mechanism for automatic water flow |
| Warranty Period | 3 months |
| Intended Use | Removing fish feces, impurities, turbid water from fish tanks |
As soon as I squeezed the siphon ball a few times, I was amazed at how effortlessly the water started flowing without any vigorous blowing or fuss. The design makes it so simple to activate—just a gentle pinch, and the water rushes out smoothly, pulling out debris and fish waste with barely any effort.
The 7-foot hose feels sturdy yet flexible, and I noticed it doesn’t kink or tangle, which is a huge relief during cleaning. Its clear, elastic plastic construction means I can see exactly where the water is flowing, making the process more controlled and less stressful for my fish.
The gravel tube sinks easily and the detachable filter screen inside is a smart touch. It prevents debris from getting stuck and keeps my fish calm, as it doesn’t disturb their decor or movement.
I also appreciate that the tube is harmless to my fish—no chemical smells or sharp edges here.
The overall experience is smooth; even my kids can handle it with ease, which makes regular cleaning less of a chore. It’s lightweight, portable, and sturdy enough to handle regular use.
Plus, the 3-month warranty adds peace of mind, knowing I can get a replacement if anything goes wrong.
Overall, this siphon turned my weekly tank maintenance from a hassle into a quick, simple task. It’s reliable, easy to control, and works well with both gravel and sand.
Honestly, it’s become my go-to tool for keeping my aquarium clean without stressing the fish.
Laifoo 5ft Aquarium Siphon Vacuum for Gravel & Sand Cleaning
- ✓ Easy to control flow
- ✓ Durable, kink-resistant hose
- ✓ Gentle on fish
- ✕ Slightly thinner hose
- ✕ Limited to smaller tanks
| Hose Length | 5 feet |
| Hose Material | Clear, elastic plastic |
| Hose Durability | Anti-kinking, durable |
| Gravel Tube | Sinkable with detachable filter screen |
| Siphon Operation | Manual pinch ball for automatic water flow |
| Warranty Period | 3 months |
I wasn’t expecting a siphon to surprise me, but when I first used the Laifoo 5ft Aquarium Siphon, I was genuinely impressed by how effortless it was to get water flowing. The moment I pinched the siphon ball and saw the water start to transfer without any fuss, I realized I’d found a game-changer for my weekly cleanups.
The clear, elastic hose feels sturdy yet flexible, making it easy to maneuver around the tank without kinking or bending. The 5-foot length gives you plenty of reach, so you don’t have to strain or get too close to the tank edge.
I also appreciated that it’s made from harmless, odorless plastic—no weird smells or chemical tastes in the water.
The gravel tube sinks gently without disturbing my fish or decorations, thanks to the detachable filter inside. It’s a simple feature, but it makes a big difference when you’re trying to clean without stressing your aquatic buddies.
Plus, the entire process is quiet—no loud sucking or blowing needed, just a few pinches on the siphon ball to start the flow.
Using this siphon has made gravel cleaning much less tedious, especially because it controls water flow smoothly and efficiently. I do wish the hose was slightly thicker for extra durability, but overall, it’s a reliable tool that handles all my cleaning needs with ease.
For anyone tired of complicated or unreliable siphons, this one is a breath of fresh air. It’s straightforward, effective, and gentle on your fish—what more could you ask for?
AREPK Compact Aquarium Siphon & Water Changer Kit
- ✓ Easy to maneuver
- ✓ Multi-functional heads
- ✓ Fish-safe materials
- ✕ Slightly tricky to clean pump
- ✕ Limited for very large tanks
| Material | High-quality, fish-friendly, odorless transparent tubing |
| Cleaning Heads | Three independent heads with brush and sponge attachments |
| Suitable Tank Size | Effective for tanks above 10 gallons and under 10 gallons |
| Tube Diameter | Designed for efficient water transportation, specific diameter not specified but optimized for small tanks |
| Pump Type | Manual siphon pump with detachable pump head for cleaning and unclogging |
| Additional Features | Replaceable sponges, pipe fixing clamp for spill prevention |
There I was, knee-deep in my small betta tank, struggling to reach the tiny corners behind the plants without disturbing everything else. That’s when I grabbed the AREPK Compact Aquarium Siphon & Water Changer Kit.
The first thing I noticed was how slim and flexible the tubing felt in my hand—easy to maneuver into those tight spots.
Using the kit was surprisingly straightforward. The transparent tube is fish-safe and odorless, so I didn’t worry about any harmful chemicals.
The pipe fixing clamp kept everything steady, preventing spills while I worked. The three different cleaning heads made it simple to switch from scrubbing algae on the glass to removing debris between rocks.
The upgraded cleaning head with a sponge and brush really impressed me. I could scrub stubborn algae without scratching the tank walls, and the sponge cleaned surface grime efficiently.
The thinner straw was perfect for reaching into narrow crevices without disturbing my decorations or plants.
What I appreciated most was how versatile this kit is. It handles water changes, gravel cleaning, and algae removal with ease.
Plus, it’s compact enough for tanks under 10 gallons but also works well on larger tanks over 10 gallons. It made my routine quick, clean, and hassle-free.
Overall, this siphon is a genuine game-changer for small tank owners. It saves time, reduces mess, and keeps my aquatic environment pristine.
The only minor hiccup was that the detachable pump head needed a little extra care to keep clog-free.
What is an Aquarium Siphon, and How Does It Function?
An aquarium siphon is a device used to remove debris, waste, and excess water from an aquarium while simultaneously facilitating water changes. It operates on the principle of suction, allowing users to clean the substrate and maintain water quality effectively without the need for manual scooping or vacuuming.
According to the Encyclopedia of Aquarium Sciences, siphons are crucial tools for aquarium maintenance, enabling hobbyists to perform regular cleaning tasks efficiently while minimizing stress to aquatic life (L. L. Miller, 2020).
Key aspects of aquarium siphons include their design, which typically features a tube that extends into the aquarium and a bulb or pump mechanism to initiate suction. Many siphons also incorporate a gravel vacuum attachment, allowing users to lift debris from the substrate while minimizing the disturbance to the gravel bed. The size and length of the siphon tube can vary, catering to different tank sizes and depths, which is essential for achieving optimal cleaning results.
The impact of using an aquarium siphon is significant for maintaining a healthy aquatic environment. Regular use of a siphon helps control ammonia and nitrate levels, which can spike due to uneaten food, fish waste, and decaying plant matter. This is especially important in freshwater and saltwater tanks, where poor water quality can lead to stress or disease in fish and other aquatic organisms. Statistics indicate that routine water changes combined with siphon use can significantly lower harmful toxin levels, promoting a more stable ecosystem.
The benefits of applying a siphon in aquarium maintenance are numerous. It allows for more efficient cleaning, leading to healthier fish and clearer water. Additionally, siphoning can help hobbyists save time, as it automates part of the water change process and reduces manual labor. This efficient cleaning method also encourages more frequent maintenance, which is essential for fostering a thriving aquatic habitat.
When selecting the best siphon for an aquarium, it’s advisable to consider factors such as tank size, the type of substrate, and the specific needs of the aquatic life present. Best practices include using a siphon with adjustable flow settings, ensuring the siphon is easy to clean after use, and utilizing a model that is comfortable for the user to handle. Regularly checking and maintaining the siphon’s components can also enhance its longevity and performance.
What Key Features Should You Look for in an Aquarium Siphon?
When selecting the best siphon for an aquarium, several key features should be considered to ensure efficient maintenance and ease of use.
- Length of the Hose: A longer hose allows for more flexibility in reaching different areas of the aquarium, especially larger tanks. It should be long enough to allow you to siphon water into a bucket or drain without needing to reposition frequently.
- Diameter of the Hose: The diameter affects the flow rate of water being siphoned. A wider hose will typically remove debris and water more quickly, which is beneficial for larger tanks or heavier waste buildup.
- Type of Siphon (Manual vs. Electric): Manual siphons require physical effort to get started, while electric siphons provide a hands-free experience. Electric models can be more efficient and less labor-intensive, making them ideal for larger aquariums.
- Filter Attachment: Some siphons come with a filter attachment that prevents gravel and larger debris from being sucked up while still removing waste. This feature is particularly useful for maintaining a clean substrate without disturbing the tank’s ecosystem.
- Ease of Use: Look for features like a pump or bulb to easily start the siphon and a comfortable grip. Ergonomically designed siphons can reduce strain during cleaning sessions, making the process more enjoyable.
- Build Quality: A durable siphon made from high-quality materials will last longer and withstand regular use. Ensure that the components are resistant to wear and tear, as well as safe for aquarium environments.
- Portability and Storage: Consider how easy it is to store the siphon when not in use. A compact design or one that can be disassembled easily will be more convenient, especially if you have limited storage space.
How Does the Design of a Siphon Impact Its Functionality?
The design of a siphon significantly influences its effectiveness in aquarium maintenance and water changes.
- Tube Diameter: The diameter of the siphon tube affects the flow rate of water being siphoned. A wider tube allows for a greater volume of water to be moved quickly, making it ideal for larger aquariums or for removing debris efficiently.
- Length of the Siphon: The length of the siphon tube can impact ease of use and suction power. A longer siphon may require more effort to create suction, while a shorter siphon can be more manageable but might not reach deep areas of the tank.
- Shape of the Siphon: The shape of the siphon, including any bends or curves, can influence water flow and vacuum efficiency. A straight design typically allows for a smoother flow, while complex shapes may create turbulent flow patterns that can hinder performance.
- Material Construction: The material of the siphon affects durability and flexibility. Plastic siphons are lightweight and affordable, but may not last as long as those made from more durable materials like glass or heavy-duty plastic, which can withstand frequent use.
- Filter Attachment Options: Some siphons come with filter attachments that help remove debris while preventing substrate loss. This design feature is beneficial for maintaining water clarity without disturbing the aquarium’s ecosystem.
- Ball Valve or Control Mechanism: Siphons with built-in ball valves or flow control mechanisms allow users to adjust the flow rate. This feature is particularly useful for targeted cleaning and for minimizing disturbances in the aquarium environment.
What Materials are Most Effective for Aquarium Siphons?
The most effective materials for aquarium siphons include:
- Plastic: Plastic siphons are lightweight, easy to handle, and resistant to corrosion, making them popular among aquarium enthusiasts.
- Silicone: Silicone tubing is flexible and can withstand bending, which allows for easier maneuverability around the aquarium’s edges and decorations.
- Glass: Glass siphons offer durability and a clear view of the water flow, which can be helpful for monitoring the cleaning process.
- Stainless Steel: Stainless steel siphons are robust and resistant to rust, providing a long-lasting option that can handle frequent use.
- Rubber: Rubber attachments can provide a tight seal and can help in creating a strong suction, which is essential for effective debris removal.
Plastic siphons are favored for their affordability and accessibility, making them a common choice for both beginners and seasoned aquarists. They are also typically easier to clean and maintain compared to other materials.
Silicone tubing is particularly advantageous due to its flexibility, allowing users to navigate complex aquarium layouts without kinking or damaging the hose. This feature helps in reaching all areas of the tank for thorough cleaning.
Glass siphons, while less common, provide an aesthetic appeal and durability that can withstand wear and tear. Their transparency also allows the user to observe the siphoning process closely, ensuring efficient cleaning.
Stainless steel siphons are a premium choice for those looking for longevity and strength, especially in larger tanks. They resist corrosion and can handle the rigors of regular maintenance without degrading over time.
Rubber attachments enhance the efficiency of siphons by ensuring a secure connection and maximizing suction power, which is crucial for removing substrate waste and debris effectively from the aquarium floor.
What are the Best Types of Siphons for Different Sizes of Aquariums?
The best types of siphons for aquariums vary depending on the size and specific needs of the tank.
- Small Siphon (for tanks up to 20 gallons): A small, manual siphon is ideal for smaller aquariums, as it allows for easy cleaning without disturbing the fish too much.
- Medium Siphon (for tanks between 20-50 gallons): A mid-sized siphon with a wider diameter and a manual or battery-operated pump can efficiently remove debris and perform water changes in medium-sized tanks.
- Large Siphon (for tanks over 50 gallons): A large, electric siphon system is best for big aquariums, as it can handle significant water volumes and automate the process of cleaning and water changes.
- Gravel Vacuum Siphon: This type is specifically designed with a gravel tube, making it effective for removing waste from the substrate while minimizing the loss of gravel.
- Cyclone Siphon: A cyclone siphon is great for all tank sizes and works by creating a vortex that lifts debris and water simultaneously, ensuring thorough cleaning.
A small siphon is perfect for tanks up to 20 gallons, as it is compact and allows for manual control, helping to reduce stress on fish during maintenance. These siphons are usually designed with a simple bulb or squeeze mechanism that creates suction without the need for complex setups.
For medium tanks between 20-50 gallons, a siphon with a wider diameter offers improved efficiency in removing waste and facilitates larger water changes. Battery-operated options are available for convenience and to reduce manual effort, making the cleaning process quicker and easier.
In larger aquariums exceeding 50 gallons, electric siphon systems are highly recommended due to their ability to handle heavy-duty cleaning tasks. These systems can automate both the suction of debris and the process of water changes, which is especially beneficial for maintaining water quality in larger setups.
The gravel vacuum siphon is specifically designed to clean substrate effectively while allowing gravel to remain undisturbed. This is crucial for keeping beneficial bacteria intact, which are essential for maintaining a healthy aquarium ecosystem.
Lastly, the cyclone siphon utilizes a vortex mechanism to simultaneously lift debris and water, providing an efficient cleaning solution suitable for all tank sizes. Its design allows for thorough cleaning without the need for repeated manual effort, making it a versatile option for aquarium enthusiasts.
Which Siphon is Best for Small Aquariums?
The main options for siphons suitable for small aquariums include:
- Python No Spill Clean and Fill System: This siphon is designed for ease of use and convenience, especially for smaller tanks.
- Marina Easy Clean Gravel Cleaner: A compact siphon that combines gravel cleaning with water changing, ideal for small setups.
- Aquarium Vacuum Siphon by Aqueon: This siphon offers a simple, effective way to clean substrate while performing water changes.
- Fluval Edge Gravel Cleaner: Specifically designed for smaller aquariums, providing efficient cleaning with minimal disruption.
Python No Spill Clean and Fill System: This siphon is highly efficient and allows for water changes without the need for buckets, making it a favorite among aquarium enthusiasts. Its long hose enables you to reach your sink easily, and its design minimizes spills, which is particularly beneficial for smaller tanks that require careful handling.
Marina Easy Clean Gravel Cleaner: This siphon is designed for straightforward operation, featuring a simple squeeze mechanism that removes debris from the substrate while simultaneously changing water. Its compact size makes it perfect for small aquariums, as it can easily maneuver around decorations and plants without causing disturbance.
Aquarium Vacuum Siphon by Aqueon: This siphon is known for its user-friendly design, allowing hobbyists to clean the gravel and siphon water quickly. It includes a tapered nozzle that helps to target waste effectively, ensuring a clean tank without needing extensive effort or time.
Fluval Edge Gravel Cleaner: Tailored for smaller aquariums, this siphon features a unique design that allows for efficient cleaning with minimal water disturbance. Its fine mesh filter prevents gravel from being sucked up, making it ideal for delicate substrates and ensuring a thorough clean while keeping the tank’s environment stable.
What Siphon Works Best for Large or Established Aquariums?
The best siphons for large or established aquariums often possess features that enhance efficiency and ease of use.
- Python Pro-Clean Siphon: This siphon is renowned for its robust construction and versatility, making it suitable for larger tanks.
- Tetra Pond Water Garden Siphon: Designed for both aquariums and ponds, this siphon offers a powerful suction that can handle substantial debris removal.
- Aqueon Water Changer: This siphon system allows for easy water changes without the need for buckets, perfect for larger setups.
- Lee’s Ultimate Gravel Vacuum: This siphon features a wide diameter and a strong suction, allowing it to effectively clean gravel in larger aquariums.
The Python Pro-Clean Siphon stands out for its durable design and ease of use, featuring a long hose that enables users to reach their tanks easily. It includes a water changer attachment, making it ideal for performing significant water changes in larger aquariums while minimizing mess.
The Tetra Pond Water Garden Siphon is particularly effective for removing debris from the substrate and works well in both aquariums and outdoor water features. Its strong suction capability makes it a favorite for users with larger tanks that require thorough cleaning.
The Aqueon Water Changer simplifies the water changing process by connecting directly to a sink, which reduces the manual labor involved in transferring water. This feature is especially beneficial for large aquariums, as it allows for quick and efficient water changes without the need for additional equipment.
The Lee’s Ultimate Gravel Vacuum is designed specifically for larger tanks, featuring a wide suction tube that can easily remove waste and debris from the substrate. Its robust performance makes it a reliable choice for maintaining cleanliness in established aquariums with significant gravel beds.
How Can Using a Siphon Improve Aquarium Maintenance?
Using a siphon can significantly enhance aquarium maintenance by ensuring efficient cleaning and water changes.
- Efficient Debris Removal: A siphon effectively removes uneaten food, fish waste, and other detritus from the substrate of the aquarium. This helps maintain water quality by reducing ammonia and nitrate levels, preventing harmful spikes that can affect fish health.
- Water Changes Made Easy: Utilizing a siphon allows for easy and controlled water changes, making it simple to remove old water while simultaneously introducing fresh water. This process minimizes stress on fish and prevents sudden changes in water parameters.
- Versatile Designs: The best siphons for aquariums come in various designs, including gravel vacuums and automatic siphons, each tailored to different tank sizes and types. This versatility ensures that aquarists can choose the most suitable tool for their specific needs, enhancing the overall maintenance experience.
- Prevention of Algae Growth: Regularly using a siphon helps to prevent algae buildup by removing excess nutrients and organic matter that feed algae. This proactive approach reduces the frequency and intensity of algae blooms, contributing to a healthier aquarium environment.
- Time Efficiency: A siphon streamlines the cleaning process, allowing aquarium owners to perform maintenance tasks more quickly and effectively. This efficiency not only saves time but also encourages more regular upkeep, leading to a thriving aquatic ecosystem.
What are the Best Practices for Using an Aquarium Siphon?
Using an aquarium siphon effectively involves several best practices to ensure a clean and healthy environment for aquatic life.
- Choose the Right Siphon: Selecting the best siphon for your aquarium size and type is crucial. Consider factors such as the length of the tube, the diameter, and whether it has a gravel cleaner attachment to suit your specific cleaning needs.
- Know When to Siphon: Timing your siphoning is important; it should be done during regular water changes or when you notice a buildup of debris. Typically, a frequency of once every two weeks is recommended for most aquariums to maintain water quality.
- Technique Matters: Employ the right technique to maximize efficiency and minimize stress on your fish. Start by submerging the siphon in the water, creating a suction without causing a disturbance, and allow it to gently pull debris while avoiding excessive substrate removal.
- Monitor Water Levels: Keep an eye on water levels while siphoning to prevent a sudden drop that could stress fish. Always have a plan for refilling the tank afterward, checking for temperature and pH balance to ensure a smooth transition.
- Clean the Siphon: Regularly clean your siphon to prevent algae buildup and ensure the best performance. Rinse it with warm water and check for blockages in the tube to maintain efficient suction during use.
What Common Mistakes Should You Avoid When Using a Siphon?
When using a siphon for aquarium maintenance, several common mistakes can hinder its effectiveness and potentially harm your aquatic environment.
- Not Prime the Siphon Properly: Failing to remove air from the siphon can lead to inefficient water removal.
- Using the Wrong Size Siphon: Choosing a siphon that is too small can prolong the cleaning process, while one that is too large can disturb substrate and stress fish.
- Neglecting to Clean the Siphon: Over time, debris can accumulate in the siphon, reducing its efficiency and potentially introducing harmful bacteria into the tank.
- Improper Positioning: Not considering the angle and height of the siphon can result in water not flowing effectively, causing frustration during the cleaning process.
- Forgetting to Monitor Water Levels: Failing to keep an eye on water levels during siphoning can lead to over-extraction, which can harm fish and plants.
Not priming the siphon properly can result in air pockets that prevent water from flowing smoothly, making the cleaning process much less effective. Always ensure that the siphon is filled with water and that any air is expelled before you start siphoning.
Using the wrong size siphon can be detrimental; a siphon that is too small may require multiple passes to clean the tank, while one that is too large can uproot plants and disturb the fish, leading to stress in your aquatic environment. Choose a siphon that fits the size of your aquarium for optimal results.
Neglecting to clean the siphon can lead to clogs and reduced suction power, which means less effective cleaning. Regularly rinse and clear any build-up to maintain the siphon’s functionality and ensure a healthy environment for your fish.
Improper positioning of the siphon can drastically affect water flow; if the siphon is angled incorrectly or placed too low, it may not draw water effectively. Adjusting the angle and ensuring it sits at an appropriate height can enhance performance.
Forgetting to monitor water levels while siphoning is a common oversight that can lead to excessive water removal, which can stress or even harm aquatic life. Always be aware of how much water you are taking out and refill the tank accordingly to maintain a stable environment.
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