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That didn't look like brown jelly - is the skeleton white where the "stuff" comes off? You can't frag and put them back in the same tank - I'd set up quarantine immediately and isolate the fragments - and, some photos if possible. The lack of effectiveness of antibiotic doesn;t surprise me at all. If the AB's didn't make a difference, its probably not bacterial - as is all too often the case, despite these persistent notions of bacterial pathogens present and slaying corals all the time and perpetuated by many authorities.
Can we get some more history of the tank and the first affected coral, too?
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Eric Borneman
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