I've got an Amiricle pro-line 1000 filter. Do you guys put a clean up crew in the actual filter? I don't know if I have the filter set up right, its seems like there's a lot of "stuff" floating around in there. My nitrates and nitrites were ok last time I tested my water, so I don't think it's harming my tank that much, but I bought the filter used. I've got the bioballs in the middle section, and a "built in" skimmer that does work. If I can figure out how to post pictures on here, I'll take a picture of my set up.