Mutated Zoa?

[NSS]

I'm quite new to the reef tank hobby. (About 6 months). Had my ups and downs with different Zoa colonies. In the image you can see a few Cats Eyes polyps and then that blue "thing" below them. It came with the frag and it was tiny when I got it. It is growing though. There is a similar center "mouth" like the other zoas and it even appears to have the same green-ish color in the center. It doesn't look like it has a stalk and it doesn't close or retract like normal Zoas. It only reacts in a minimal way when I touch it.
Any idea what this is?

 

[workhz]

Mushroom.

 

[SchrutesReefs]

+1 on the shroom. Nice color for a hitchhiker

 

[vetteguy53081]

Blue mushroom - One of my favorites but grows fast

 

[workhz]

It's the ones that 'mutate' into aiptasia that you need to watch for.