Are these Hydroids?
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Is that only way to remove. Not wirried about this piece of dead coral on top of frag plug. I can remove that but I see some Similar looking strings on a couple of other piecesMost likely, dwarf angels eat those, sometimes. or you can use tweezers to remove them. Really have to get down in the rock though.. Unless it's some kind of weird algae...
Bumping my own post but just got a possible identification at my LFS.
Are these Hydroids?