I've always attributed it to something that changes the surface tension of water. Cyclopeeze and garlic extra can cause my skimmer to go bananas like that, even hours after feeding. I've even found that the mucus caused by some corals (namely a leather) can cause the skimmer to overflow.
I'll poke through my aquaculture engineering book in the skimmer section to figure out why they do this. I've been curious as well.
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