phhhpt, you'd have to skim an insane amount to "overskim" IMHO.
Even if you have an awesome skimmer pulling tons of crap (yes, remember what it is) out, you and your fish are constantly resupplying the crap on a daily basis. If you're really that concerned, skim dry then you'll know that you aren't pulling any water out with the crap.
I doubt any HOB skimmer out there is powerful enough to "overskim" - their little pumps simply don't draw enough air to do so.
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