How long have you had the skimmer? When did it start this random overflowing? When's the last time you gave the whole thing a good vinegar bath including the venturi? Fwiw, I also think that considering the water depth is a reasonable step. manufacturer recommendations don't always turn out to be the best. Setting a tile or two under the skimmer might be an easy solution.
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Originally Posted by MarkoD
I have a csc250 on my 100 gallon total volume system.
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Fwiw, skimmer sizing has more to do with display volume than total system volume (within reason). This is because of the potential bioload, and generally the bioload is a direct reflection of the display tank size. Do you have a very light bioload?