Sometimes my Acan war coral has those same things come out of it and "I believe" they are stingers that sting and digest other corals if they "sense" them. any chance that it got moved closer to another thing or something fell beside it?
Also sometimes my brain coral will be deflated and not eat for a few days and looks kinda sick but after like 2 days its inflated and healthy
The coral you have looks healthy still so i wouldn't do anything drastic maybe dip it if your worried in like coral Rx
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Current tank---125 gallon mixed reef 60 gallon sump, Reef octopus nw200 skimmer, Rapid LEDs, Maxspec gyre, Mp10s, Fuge, Biweekly 20% WC, QT everything
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