Couple newbie Gfo running in a reactor qs

[Proteus]

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