That is exactly what I have. It's on the right and left side of my tank but not really the center and it is almost gone at night when lights out and it shows up when lights come up. Is this according to your theory cyano or not cyano?
This is something I am gathering data on. I have a theory about this occurrence. More lab tests before I can come to a definitive conclusion. You are on the right track though. I think this possibly can be the indicator.
Yes the 14 days is to aid in the death of free floating cells. I am calling it the safety zone.
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