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It is a build up of proteins, they need to be in the water to be removed by the skimmer. I agree that increasing flow through the overflow is better, but IME a powerhead will work just as well. On my 75, I had that problem, and put a 200gph powerhead in, and pointed it up. At first the scum broke up and floated around, but then started getting pulled down. I think the surface tension of the big chunk had more power to fight the pull of the overflow. Once you break the surface tension, there is not as much strength and the overflow works better. I could literally could see the, now little chucks of surface scum, go through the overflow followed by the skimmer going CRAZY!
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Some people say, "How can you live without knowing?" I do not know what they mean. I always live without knowing. That is easy. How you get to know is what I want to know. - Richard Feynman
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