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No problem!
In my regular tanks I literally did nothing and they went away. When it popped up in the seahorse fry tank, it had to be taken care of or it would sting the babies to death. Three hydroids could cover a tiny fry! Twice a day I would siphon them out. It was a breeding tank, so fry was a "natural problem" with the types of foods and nutrient level. Went I found the polyps growing amongst some algae, I was able to permanently remove them from the tank.
I've had all sorts of hydroids. I'm the kind of person to let everything grow, just to see what it will do. Sometimes it backfires and I realize I maybe should have removed something when it was a singleton and not a whole army.

