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Thanks everyone! I put the biosponge in the bottom basket along with another finer sponge I had laying around. I moved the prefilter media in with the biomax in the middle basket. The top basket now has the carbon, purgin, and filter floss. So hopefully all that will help! What exactly is...

Hello- I'm having issues with my canister filter. I'm an experienced keeper of freshwater aquariums, but I can't figure out what's going on here (and this is my first time I've ever used a canister filter). For ~7 years I've had one or two Penguin 200 biowheel filters on my 36 gallon...