Koralia is a brand of powerhead. From what I can figure, when you said you had 3 sources of flow, you meant the powerhead, the return pump (from the sump), and the canister filter.
It would be great if you could get a picture of the algae in sump! It's likely a macroalgae called Chaetomorpha that likes a lot of flow (why a lot of people grow it in the sump), and grows free floating, very good for nutrient export... BUT, in my opinion a fuge needs to be rather larger than many people have made them to be efficient. Would it be possible to get sort of a full tank shot of your sump area?
I suspect that by moving your skimmer to another area in the sump you could get it into an area that has a constant level, so that you could dial in the skimmer and not have to worry about it too much... it sounds like to have to fiddle with it regularly to get it to skim properly?
It almost sounds like you need an automatic top off device to keep your water level constant.
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Calvin
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Planning a 29 gallon mixed reef...
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