what is this?

[B-Rye]

picked up a zoa frag with what ever this stuff is. They LFS guy said it might be a sponge, but its hard.

 

[I never finish anythi]

I see a possible aiptasia on the left but can't make out what you mean . The picture is not very clear . Can you circle what you are talking about.

 

[twentyleagues]

picked up a zoa frag with what ever this stuff is. They LFS guy said it might be a sponge, but its hard.

I think the tubes may be hydroids. Or tube worms. Its hard to tell pic is blurry

 

[Tahoe61]

Hydroids. I wouldn't introduce the frag to my system.

 

[vetteguy53081]

picked up a zoa frag with what ever this stuff is. They LFS guy said it might be a sponge, but its hard.

I see colonial hydroids and an aptasia- both which multiply and be a nuisance. Hydroids multiply as long as they get food. You can remove rock or direct flow at them to prevent food from reaching them.

 

[B-Rye]

I found another thread with them
https://www.reef2reef.com/threads/are-we-sure-these-are-colonial-hydroids.797406/

 

[B-Rye]

I will move them off the rock work for the time being till I can assess if they have the ability to take over.

 

[B-Rye]

If they do run the risk of taking over I will try and get that zoa off and then attempt to acclimate them to my brackish tank.

 

[B-Rye]

Kinda stoked to have found some jelly fish!