Is this a mushroom? If so what kind?

Im not exactly sure what this is. It came on a rock i got. The guy said he had seen in for a long time, but it never did anything. Since i have put it in my tank, its been opening and growing, and another one has sprouted up right next to it as well. Guess it pays to have decent lighting. lol

I know the pix are horrible, had my sister take them really quick. If better pics are needed let me know.

Any idea what this is?
Thanks

 

Looks like a brown Zoa

 

from the pics that you've provided it "appears" to be a simple common brown "button polyp" ( zoanthid )
if another popped up beside it ' thats a good thing !

 

Looks like a zoa, good for you (if you wanna keep softies that is)!! I just added several clusters to my tank, I like them and my wife likes the "flowie things" too! Anything to keep her interested in the tank!! If light and water quality are good you'll be fragging them off before you know it!!

 

Guys i think youre right. Yeah sorry the pix sucked. Looking closer, i can see the edges of the polyp have little rough fringes/start of tentacles or whatever they may be called. They are a welcome addition right now to my tank right now so hopefully all goes well and they grow nicely like youve mentioned.
I have a 175w MH pendant w a 14k bulb. The water quality isnt bad for a noob.

Second little sprout wasnt even showing up 2 weeks ago and is already 1/2 the size of the other one. ;-)
Thanks guys

 

exactly mission ' all to often people tend to forget or new to the salt water reef' that they can pick up lots of goodies from paying attention to live rock .

if any thing matters most'. i think ' it's got to be "PAITENCE" !

 

Several weeks ago I bought a BTA on a rock. On the back side of it it had 3 small brown things that looked like Zoanthids, but not sure cuz they look different from some other ones I have. They've the same type stalk, but the disc has little 'fingers' if you will on the disc and I dont mean just on the fringe. My other Zoas have long tentacle type things just on their fringe whereas these brown ones look similar save for the short stubby 'tentacles' across the disc....Also, the brown ones (now) are bigger in circumference.

Same thing as posted in this thread???