Id help hydroid?

[Dimitri Arvanitis]

Good evening,
I have noticed a big area on a live rock covered by this polyps. Most of them have a thin body with a pulsating head without any tentacles. Few of them have a tubular body in which they retract their tentacles ( 8 or 10 I guess ) when they feel in danger.
Hydroids??

 

[Dimitri Arvanitis]

Other pic

 

[Palyzoa]

Looks like it could be hydriods, lets ask the pros. #reefsquad

 

[DSC reef]

I can't tell if there feather dusters or colonial hydriods

 

[Dsnakes]

I would go with colonial hydroids, especially if they looking like they're pulsating.

Unless they are coming out of tubes and they retreat? Hard to tell their bases from the picture.

 

[Holy_makerel]

I'd say hydroids

 

[Dimitri Arvanitis]

Definitely hydroids!!
My tank is running from about 45 days. I have only a few snails, I'ld like to get a peppermint shrimp a clown fish an euphillia,caulerpa and zoas. Do you think hydroids could harm these animals? Thanks

 

[Florida Sunshine]

Get them out as fast as you can. The best way is to remove the entire rock. Otherwise chip them off of the rock and hope. They will quickly take over the tank (as they have mine). There is only one known treatment for them and it will kill all my inverts so I am going to have to set up an invert only tank for 3 months while I treat the display.
They are bad news.