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So is,that a good,thing or a bad thing+1 for Hydroid. Looks like Hydroids - Candelabrum spp (Digitate Hydroids)
They're known to be a bad hitchhiker. They capture particles out of the water column which isn't necessarily a bad thing, but their sweepers can/will irritate corals. Information on them is limited. Since they retract into the rock at the first sign of an intruder it is hard to pinpoint their base. You may have luck putting putty or glue over them, but I have no experience removing them that way.So is,that a good,thing or a bad thing