Based on the die off I was seeing, which was sometimes identical coral frags on different sides of my system going at the same time/rate, I think it was a combination of what I had posted in the Zoa grow out. My water was too clean, nutrients too high, alk too high, trace elements possibly out of sorts. I was seeing super fast growth of some corals but they were too stressed to sustain it. Leaning heavily towards aquarist error. Cleaned my powerheads today. That was also overdo.
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