Is there a strong flow under the skimmer that may be pulling bubbles out from an undertow? I don't think you are crazy, but the skimmer is relatively simple and I can't think of any defect that would cause this and we have used one long term and at shows and have not seen this ourselves, I have had a few reports of this so my suggestions were based on what we have found caused other issues.
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Roger Vitko
Tunze USA
"He's for every one of us, stands for every one of us, he'll save every man, woman and child in a mighty Flash!"
Current Tank Info: 210 gallon planted tank with Altum Angelfish
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