After watching videos of using a sponge filter, I decided to use two of these in my last (40 gallon) tank. I was concerned about buoyancy issues; However, the basis weight was successful. It keeps the sponge submerged in the water while creating very good aeration, and the heavy base withstands the constant grit of my curious musk turtles. I am planning to install Powkoo Sponge Filter Angled Filter Sponges in my other aquariums.
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