Just taking a guess here, but has your nutrient level changed recently? More specifically from high to low? I personally have noticed this myself in montapora but not exactly how yours is showing. Usually when I had issues with it, it was more like white dots splashed all over the coral.
Water is good. I mean calcium in little low 400 to 420. But just got brs 2 part. Do will try to raise thst up w little. Alk is 8. Little low. But has been stable and been dosing a little everyday to keep it stable. The white spot hasn't gotten worse and don't see any nudibranchs when I pick coral up. Will keep and eye on it and see. If it doesn't get worse I think i should be ok.
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