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  1. whisper 30i in-tank filter missing suction cup

    Freshwater and Tropical Fish
    I recently just set up my 20 gallon tank with a whisper 30i filter and realized that there isn't a suction cup on the back exposing a hole in the filter, and instead of all the water going through the cartridge some is escaping through this hole. I was wondering if this is a big deal and if it...
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