vetteguy53081
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Low alk - also check calcium. You want 8-11. Alk and CA work together- assure both are balanced. PO4 , yes is high. Rowaphos or ChemiPure blue will bring it down safely and keep level in checkFrom my experience sinking PO4 and prolong time at levels below 0.04 leads to what you describe.
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same coral now:
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Also NO3 and PO4 levels for reference
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One possible cause.
When PO4 is above 0.1 I did not observe this behaviour.
Again, a system with a high coral mass likely benefit trace dosing. Like I said, Abe from CE, and Tim, aka therman, have coral mass per volume like none other. Look at Charlie's tank, filled to the brim with coral. You are NOT the 1st person I have communicated with concerning AFR.
) in what I would also call nutrients on the lower side (0.08 and 4.6).

