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I always try to start less invasive and work my way up. I agree with Mcgyvr looking for a grazer that takes care of that may be a fools errand. I have tangs and gobble up HA if it ever pops up, but not every member of the species will do that. How I would start is try to remove the fish if you can. Than I would start doing some Lanthanum Chloride dosing to bind up all the phosphate. Try to catch as much as you can but some will end up on sand and substrate, no way to avoid. It is not harmful unless it gets in you fishes gills and will stay as a precipitate unless your PH really drops. I would combine the LC with lights off for a week.
Next step is to get your parameters stable without doing the 'grenade' technique. RO water definitely the way to go and measuring nutrients to make sure they don't get so high that this happens again.
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