Unkown coral ID please

[Camocustom]

I have a piece of a green sea mat. The rock was 75% covered with beautiful green polyps, 4 weeks later a turf war is present. Only thing, have no idea what the other coral is. It is reactive to touch, slimy. Its swollowing and covering polyp after polyp. Heres a pic of it, sorry camera wasnt cooperating at that moment, did best i could. Could someone help me out to what it is, how far will it spread(i know the sea mat is done for), i would appreciate it

 

[blackcloudmedia]

What in poop???? THat looks like a colony of zoanthids getting overgrown by coral.

 

[Charlesr1958]

Best first guess, a colonial tunicate?

Chuck

 

[Camocustom]

thats a good guess...didnt even think of that. Now that you mention it, there is about 4 or 5 siphons on it, one is visible(closed) in the pictures....

 

[Anonymous]

My goodness, that is beautiful!

Is it truly as blue as the photo looks?

 

[Camocustom]

that blue is just my lights, but the zoos are a light neon green...

 

[Anonymous]

I have been looking around and I think they are colonial tunicates as well.