I've had this happen a time or two with acans. mostly colony's on rock. Cutting off the dead parts I've found the rock to have very foul smelling black holes, and in some cases a very small bright red worm. The worm isn't any thicker than a piece of string and maybe an nice long. If I notice an acan even looking slightly off now I give it a soak with a tiny bit of hydrogen peroxide. It seems to perk them right up.
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