Aiptasia?

[smm52487]

Noticed these growing out of a piece of live rock I got from a LFS. Looking for some help with ID before I remove it from the tank. Thanks in advance!

 

[jnava19]

Could be hydroids

 

[KJ]

Colonial hydroids.

 

[MnFish1]

That looks like aiptasia.........

 

[Mikedawg]

Seems like they often disappear as a tank matures or food is reduced some. Since they are isolated on a rock, I would leave them alone and consider them as adding to the diversity of your tank, with the caution that some species apparently can sting coral.

 

[smm52487]

Thanks for the replies all! After checking out pics of colonial hydroids they look like what I have when you see them in person.