Hydroids?

[gregzz4]

Photobucket it bud
XP is a lame excuse
Just load the pics already

[Frogger]

If whatever it is you don't want just cover it with a thin piece of reef epoxy. If you try to pick it off it could break into little pieces and spread.

[mohammadali]

If it's hydroid I'd take the rock our and kill it Cuz I torched it after couple months it grew again
When you burn it , it will smell bad