Colonial yellow polyps

[stingythingy45]

Anybody else have them growing on the glass?
I have about an 8" x 6" area on my side glass.I think they look kind of cool,but I'm a little afraid they might advance too much.

 

[jdeb101]

I have a few polyps that grow over the coraline on the back glass. I do have little polyps of these things scattered over my tank. They grow pretty fast and onto whatever they can attach to.