What are these?

[John3]

I’m posting this in here because I think these resemble a zoa but I don’t think they are. These are very very small, like the size of a pencil point. The centers glow green and they appear to have eye lashes like a zoa. These must have hitched in somewhere. Should I be worried of some sort of invasion?

 

[KJ]

Colonial hydroids.

 

[Oliver]

Looks like Aiptasia

 

[DSC reef]

+1 for Colonial hydroids. Not aptasia but still a pest

 

[John3]

Crud....

It’s hard to believe this just popped up like it did. I haven’t added anything to the tank in months. The plug it’s growing on has been in my tank for over 7 months now.