Hydroids can pack quite a sting, I don't know about the digitate ones but I had the myrionema (sp) ones and another kind (perhaps digitate, I haven't googled them). One did some damage and the other was "ok" (things were unhappy around them but no damage). I've tried yanking them out (their tubes are quite tough and they have anchors deep in the rock, even if you do manage to yank them out often the "root" is left and they just regrow. I've also epoxied over them. I've found you have to be really generous with the epoxy in both thickness and spread, they seem to worm right through it if it is too thin, or around it if you haven't covered enough area. The only true success I had was with taking the rock out and hammer/chisel the affected chunk right off the rock.
Good luck!
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