what are these filter feeders on live rock?

[zeldaleo]

been searching for a while and cant find them, new to hobby so super curious about anything i see in there :lmao:

 

[AlSimmons]

They look like star polyps IMO. (Briareum sp.)

 

[mhaze]

+1 Briareum spp. I've had them too. They are usually a nice bonus on good live rock but also sometimes contain a strong toxin, so wear gloves when handling.