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no idea guys? it comes out at night, is about an inch long when fully extended has short stubby tentacles and retreats completely back into the rock during the day. I can't find anything on it.
Did some research on it that sounds about right. The only problem with that is I have Fiji live rock and hidden cup corals seem to be a denizen of the Caribean and Florida. I think thats right though. I'll work under that assumption.