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I have a 75gal FOWLR with a 20gal sump for my main filtration. and a skimmer in the sump as well. i recently put a penquin 350 on the back of my tank. i was told by EVERYBODY that i talked to that the blue filter sheet inside the filter is a nitrate factory. but what about the 2 bio-wheels...

has anybody heard of or used this product? any info or comments on it would help a lot. thanks and have a great day :)