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It probably was a crab of some kind as you think.
I hate to ay it, but the crab may have been commensal, meaning it just lived there and didnt harm the coral much if at all. Even if it wasnt commensal, and did do SOME harm, chances are the crab was just coincidence, and wasnt responsible for the overall decline of the brain.
In my experience with open brains is that once they do start to go downhill, they arent real easy to get back on the right track.
Out of curiousity, did you have the brain in the sand or in the rockwork?? Putting them in the rockwork sometimes can stress themn out as they dont have control of their positioning in the rockwork like they do on the sandbed.
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Zoa and paly pics HERE
SPS pics HERE
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