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I have hydroids that are actively causing two of my corals to recede and die.I wrote this in another thread, but every time digitates (and most colonial hydroids for that matter) are described in a post, someone inevitably suggests they might be able to sting corals because of their effect on seahorses. Personally, I wouldn't worry about it- if you go searching, while this theoretical tidbit is often repeated, I was unable to find a single reference on this forum or RC to anyone actually experiencing any coral damage from these guys. At this point, I assume they're perfectly safe in a reef tank and most will go away on their own in time.