Anyone know what this is?

[reefwars]

Originally Posted by toytech

Ive got the same on some zoas , there colonial hydroids and they don`t seem to bother my stuff .If you get bored of them a little superglue bath takes care of them.

absolutely , an epoxy mat will do it to .

they do grow and spread very fast though especially if your broadcast feeding so id nip it in the butt now while its a small colonie.