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I tried and they just ripped apart off the rock. They recede when I touch them but they don't move around.Look a lot like zoa eating spider. But I can't be sure can you pluck some off with tweezers.
I thought the same but can't find the specific kind. They are tiny and don't seem to have long tentacles like some hydroids I've seen on Google.If they are sessile I'd guess hydroids.
Tunicate.