If the drain/overflow from the skimmer were to clog somehow with something, then yes, it will overflow. A snail did this on my bak-pak skimmer(with about the same diameter overflow pipe) and the skimmer started to flow over a bit. I dont think this is a very common occurence however.
Chris
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No more tanks  - Laying off the ReefCrack for awhile!
Cheers,
Chris
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