Tetra Whisper Small Aquarium Filter Cartridge 2pk

these are the filters I needed for my tanks filtration system. As these are the same thing that came with the tank they are great.

I use these for my 2 gallon Tetra tank and like them. They're easy to change and get the job done. However, they can be found MUCH cheaper ($2.97) at your local megastore (founded by Sam Walton...hint hint).

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