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So I have adjustable Topfin and Whisper IQ filters respectively in my 10 gallon and 5.5g, my Plakat is fine in the 10 gallon but I am looking to switch the Whisper to a sponge filter because my Halfmoon still has difficulty with the flow. My question is where can I buy a sponge filter? I went to PetSmart and Feeder's Supply and they didn't even know what I was talking about and they didn't carry them either when I looked for myself. I've seen some on Amazon but I don't know how reliable those are and was hoping for some suggestions.