The skimmer will be erratic during the first 2-4 week break-in period. We usually recommend having the outlet fully open (arrow pointing towards "O") and let the skimmate drain back into the skimmer during break-in.
If the skimmer is still overflowing after a couple of weeks, we would recommend doing a large water change (about 25%) and run activated carbon to help make the water less viscous (which reduces the foaming).
Let us know how it works out.
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