I have a Deltec hang on skimmer that will not overflow. The down side of this of course is that the reason that this (or other) skimmers won't overflow is that when the skimmate gets to a certain level in the collection cup it runs back into the skimmer body to go back into your tank. I know that there is a way to mod this collection cup to have it run into a collection bucket (which is what I do with my large external skimmer) but I just haven't figured it out yet.
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