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#2
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![]() critters are not going to take down a large colony in one day. it sounds like rtn or a beacking episode. a contaminent may have enterd your tank. Something like a rusting metal or copper may cause sps to bleach that fast, or a really high ammonium spike could do the trick as well. its hard to say becuase it could be any number of things. that is kind of the risk you run with trying to sps. they will be great forever and then one die out fo norwhere they might die.
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