The photo is of a Whisper 5-15 on the same tank as an AC30. As you can see, they take up the same amount of space, yet the AC is rated for much more bio-load. That is because you can pack it full of what ever bio media you wish, but the whisper just uses cartridges and a small spongy biofilter. There is much more area for bacteria to grow on the AC, and it has a much higher flow rate. The difference is clear. Get your keister out of Walmart, and get an AC filter.


Apparently, it wasn't made for tanks that small with a center brace, but I made it work.