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Ok here's a dumb question but i've been pondering this for a long time, are clean up crews actually good for your tank? I know that they eat detritus and algae but then they poop it right back into the water... I suppose they eat junk that I can't see or get too which is good, but at the same time, doesn't a clean up crew just add to the bioload? So what do you guys think, does a cuc keep your tank clean or just add extra waste into the system?