On my 20gal tank I have a hang on marineland biowheel filter. I have been told that the bio wheel becomes a nuisance after a few months and becomes a nitrite or nitrate factory and should be removed once this begins to occur. Should I take the bio wheel out and if so, when? Tank has been up almost 2 months now. It has the hang on filter and probably 30-35lbs of live rock. No skimmer, sump, etc. (probably needed but not in the budget)