See i have been using a fluval for about a year now and i never have any junk collect in it. Usually i will open it up once a month and things are fairly clean. My nitrates have always been zero and never any algea. Then again i have a fairly light bio load and i also have an aqua c remora pro with a mag 5.
Remember these are only suggestions. Everyone has different experiences so the best thing to do is what you think is right.
Steve
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