Anyone know what this is?
 

Started out as one tube, multiplied to a dozen since I've started broadcast feeding the tank with coral food. They look like super teeny tiny tube anemones with iridescent green polyps. They are definitely inside a hard skeleton, and don't look like any feather duster I've ever seen before. They're quite pretty, but with that aiptasia for scale, you can see how small and hard to photograph them they are.

http://i1100.photobucket.com/albums/...wn/file-46.jpg

the pic is hard to see but maybe sometype of hydroid is my guess

i was thinking the same thing. pretty ones tho!

Looks like an aiptasia to me. I don't see anything else in that pic, at not at that res because the pic is small in my screen.

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.

yeah this is some kind of hydroid anemone, maybe your clown will host it

It's pretty! I'd frag that!

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.

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...

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.