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.

[asylumdown]

Do hydroids form calcareous skeletons? These guys have very fragile little bony skeletons that the green polyp part retracts in to.

And I did a thorough inspection, they're in 3 other places, so they very well might be spreading...

[Starry]

colonial hydroid. can be a pest, and hard to get rid of as they are rooted in the rock and may just go around any covering you put over it. try the torch method,and fry those nasty aptasia while yer at it.
also heard some angels will eat them.