The plan I looked at has both. There is an internal box to skim and an external box to feed the sump. I don't want the internal type in that it would necessitate my drilling an existing tank. I don't even know the type of glass. This could cause a problem. Oh, that brings up another question I had. What is the purpose of two boxes. Why not have one box inside and just syphon to the sump directly. Also, I don't see how the interal box would fix the problem. It just seems that it would change it. If the feed was to fast compared to the pump the overflow box would go dry and the same thing would happen by another means.
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