Daniella, thanks for starting this thread, its time we figures this out, too many people cannot keep zoas. I love zoas and mine used to grow amazingly, then one day they started to melt, not all of them just certain colonies. I don't think it has anything to do with nitrates, mine read 0, I have noticed impovement with more frequent larger water changes so they must need something replenished. I am going to try strontium and will report back, thanks again.
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