Need an ID on this

[bluecheese]

Just found this growing on a zoa rock. Sorry for the potato picture, but this is the best I could get. It’s the brown growth behind the zoas.

Not sure what it could be. I’m not seeing it anywhere else. Plus I haven’t added anything new to the tank in over a month.

 

[ChiCity]

hydroids…

i’d remove them.
as these could become problematic…

 

[ISpeakForTheSeas]

Agreed with the above - hydroids.

 

[bluecheese]

Best way to remove them?

 

[ISpeakForTheSeas]

Best way to remove them?

Hopefully someone with experience dealing with these guys will chime in for you, but - in the meantime - I've heard smothering them with kalk paste may work, and here are some other threads with suggestions:

Hydroids: a reference to some strategies

Like many of us, I have had problems on and off over the years with Hydroids. The ones that have always given me the most problems are the common ones that almost look like a smaller and darker version of the beginner coral called Yellow Polyps. But the colonial Hydroid is much smaller than...

www.reef2reef.com

Hydroids - How do I eliminate- They have taken over my tank

So I have this stuff that has pretty much taken over my tank and I can't get rid of it. I'm looking for an ID and an eradication plan that is anything short of a total teardown.

www.reef2reef.com

 

[EeyoreIsMySpiritAnimal]

Best way to remove them?

Completely cut off that part of the rock/plug. Even if you lose a few of the zoas. You don't want it in your tank at all.

Essentially, frag the hydroids off and keep the remaining zoas, but keep an eye out for more on that rock.