Need help - ID this coral/growth

[Newms118]

So I have these little corals that are growing all over my live rock. I am attaching an image of these guys. They grow slowly, and although in the picture it looks like this is one big sheet of coral, each of these little corals are individual. The coloring of the image is also kind of bad. Under normal white lighting, they are a nice, blue color.

Just want to know if this is something I should try to get rid of, or if they are just harmless. Right now they are slowly spreading to all my other rocks, which isnt that bad since I like the blue color.

Edit: Yeah, after posting this, found an image online:
https://s-media-cache-ak0.pinimg.com/736x/82/63/f8/8263f88ab8128283eb5a0c382bca0538.jpg

Apparently they are Blue Clove Polyp Corals. Anyone have these growing as well?

 

[droth335]

We used to have them in our old tank and they are definitely colorful and pretty harmless. They spawn (not just spread by matting) so they are pretty impossible to control in the event you don't like them . Fortunately, we did like them in this tank :

 

[D-Nak]

These are common and it's terrible. It's definitely NOT harmless -- it can choke out zoas/palys which makes them close up, which eventually causes them to melt.

 

[Sugar Magnolia]

Ugh, because they are broadcast spawners they will grow everywhere. EVERYWHERE. I hated them.

 

[cadmanof50s]

As beautiful as these clove polyps may be, they could easily become your worst nightmare. They are invasive as are Green Star Polyps and Xenias. They will eventually start choking out other corals. I'm tearing down my tank to rid myself of an infestation of Xenias over the next few weeks.

 

[heathlindner25]

Worst pest you will ever run across. Start the timer on the tank break down..