The gfo should tumble but not a lot. Just enough to keep it agitated. Test the out water from reactor it may not read zero but should read close or if u have po4 in tank it will read less that DT.
Cleaning the glass is a matinee thing alway gunna have to do it but hair algea and cyano would be my tell tale signs of po4 in tank
Did you do a test of dt
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