Out of curiousty, hows your skimmer running? Is it still producing a nice thick head of foam? Typically when you reach the point of over skimming the skimmer tends to produce less and less and can no longer maintain a thick head of foam and more or less starts to fizz. Fizz is the best way I can describe it.
I had the same issues with my BM250 on my 90 gallon. I started running it with one pump instead of two and it seemed to settle in.
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Robb
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