It could be, but since the same thing is going on in my smaller tank, I am leaning towards something else.
Can't remember exact par, but I think it was in the 300-400 on the rocks. I was getting growth in the frags until end of june. Pulse 2's are on the SPS reef setting 50-95% When I had polyps they were nice and wavy.
Salinity is 1.026 checked with hanna salinity checker and refractometer. Calibrated both and checked again.
Dosing is all auto. Red sea foundations powder. Alk, cal, mag. I have noticed since June I had to really up my dosing of mag in both tanks. Previously mag was maybe 1ml/day. I am up to 5ml now for it to be stable. For reference, cal I am dosing 3ml.
I have also noticed coraline has stopped growing on the rocks. Glass and pumps only now which is a bit strange.