Is this algae?

[marcwjj]

Sorry, noob question: what is this greenish thing with a yellow lined circle in the middle? They seem to spawn in the last 2 days. Thanks!

 

[Bfragale]

Looks like some kind of cup coral. Was that live rock?

 

[marcwjj]

thanks! Yes these are live rocks I got from KP aquatics.

Looks like some kind of cup coral. Was that live rock?

 

[Bfragale]

It’s cool rock, score!

 

[Clownfish_Boy]

They look like barnacles to me.

 

[KJ]

Colonial tunicate.

 

[samnaz]

Tunicate.

 

[marcwjj]

Thanks all! Did some google search , I don’t see any live tentacles or things inside the circle, so it seems more likely to be tunicates. I will keep an eye on how it develops.