I don't know the scientific name, but they're known as Hairy Mushrooms. I have one in my tank and it does VERY well. In fact my Clown has hosted it.
By the way yours are really nice looking.
NewBe
thanks alot to you both,
now Im sure it's hairy mushroom. it looks greener in real. I got 2 types: brown base and green tips, the other light green base and brown tips. They're 3-4" when fully expanded for each individual mushroom.
I got 6 pieces of different corals for $200. The LFS would sell it for $40 (9 individual mushrooms and it's a big colony) I remember that I have them for about a month already (bought on the 12th of april), not 3 weeks. They spit in the morning every time I feed the tank with Micro.Vert made by Kent the night before that morning.
This is the other colony. now, they're spitting. I fed Kent phytoplex last night.
Interesting, this is what I've just noticed now. One of them let go its colony and moved onto another piece of LR. I think it's time to frag the other colony as well it looks kindda crowded when fully pumped.