10-Gallon Sponge Filter, Underwater Center Aquarium Filter, Works for Tropical Fish & Breeder Aquarium, Slow Current, Perfect

What Size tank can I use this cotton sponge filter for? This cotton sponge filter will work best in tanks up to 10.5 gallons when used singly. If you own a larger tank you can purchase two or more of these sponge filters and place on different sides of the tank. Considering their small size, you can easily hide these filters behind plants and other underwater décor. Why should I use an air pump with this filter and not a water pump? We recommend the air pump method as it is much easier for beginner aquarium keepers to set up. You buy this, hook it up to an airline tubing and an air pump...and go. The air pump is noiseless and won’t disturb your fish. It can be used in a quarantine (“hospital tank”), breeding or rearing tank, or as a tank for fish who prefer a slower current flow such as Neon Tetra or Betta. Can I use this sponge filter in conjunction with a HOB (Hang on the back) filter? Yes. Even if you already have another filter in your tank, you can use the sponge filter at the same time to upkeep your tropical fish tank. Your best results will be achieved by placing the sponge filter on one side and the hang-on power filter, or any other filter, on the opposite side. Can I place the filter straight into my aquarium? It is recommended to clear the tank and do the regular weekly water change before installing this filter. Recommendation: Replace this cotton every 5 to 6 months to ensure proper filtration. Steps to Use: 1. First of all, insert the plastic tube in the airline tubing (sold separately). 2. Insert one end of the airline tubing into the sponge filter. 3. Insert the other end of the airline tubing to the air pump. Now your device is ready to work.