This skimmer works great by the way. I think it was assembled incorrectly in the first place. The airline was on the output of the pump and the venturi was not sucking in much air. Once I moved the line to the input of the pump before the needlewheel it started to make tons of bubbles and filled the chamber with a milky fine bubble mixture.
The only thing I don't like is the tapered riser tube, may have to replace that with a longer non-tapered riser.
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