My best guess is a tight fitting impeller, I replied to the message you were CC'd on with BRS and I will reply once more now that I have seen the video.
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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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