Review on AQUANEAT Sponge Filter for Aquarium Fish Tank: Ideal for Betta, Nano, Shrimp, Fry. Includes Biochemical Filter, Airline Tubing, Air Pump Valves, Suction Cups. by Jennifer Romero

I didn't expect to find them at such a great price! They're great for our 20 gallon tanks and safe for frying. It's easy to clean and you can also get replacement sponges here at Revain for a very reasonable price. When they reach the end of their life, you don't need to clean them, just replace them. I will definitely buy them again and would recommend them to anyone who needs a good, reliable filter for a 20 gallon or smaller aquarium, especially if it is a cultured or live plant aquarium.