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Aeration why?

Other thing I have noticed in putting an air pump on during dark ours, as it creates a slightly different water flow which seems to shift detritus into the water column to be filtered out. Before I ran the air at night (also suffered surface film) I used to get little collections of detritus/fish poo in corners, behind bits of wood etc, usually cleaned away at water change, but now with air pump running at night don't seem to get these.
 
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