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[bradgardener]

Somehow these guys made it past my dip regimen. Closest thing I can find on Google is hydroids. Couldn’t get them in focus, small hair like “bodies” with smaller white “arms” at the tip.

 

[chaples55]

I agree some kind of hydroids. I would proceed as if they are and try to remove them from the frag and keep them from spreading. Supposedly halloween hermits and aiptasia eating filefish will eat them

 

[BristleWormHater]

Kalk will kill them, just be careful you don't get the zoas with it.