thats insane for sure, ill say this though i never had much luck with zoas in a mixed reef ive had some that done fine but it was hit or miss like you some lived for a long time and died and some never made it a week.
it could be the stars ive been reading mixed reviews on them but its funny that they target the whole colony at one time, and for them to melt so suddenly, have you had any luck on the harlequin shrimp???
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