Help Identify this free goodie.
 

Hey All.

Brand new to the forum. So let me start off saying Hey All :biggrin:

So I bought a piece of live rock today that had 5 heads of green rhodactis.
an the back side of the same rock was this little fellow. Can anyone help me confirm what it is. I believe it to be some kind of actinodiscus.
Anyways thanks all and I look forward to reading up on the forum
[IMG]http://s15.postimg.org/8qfmuf3on/IMG_2129.jpg[/IMG]
http://s15.postimg.org/fgw43uquj/IMG_2129.jpg

You are correct. Its a standard mushroom coral. Might be green or blue, depending on your lighting. I'm guessing it doesn't look similar to the green rhodactis mushrooms you bought. They are very hardy, easily reproduced and often hitchhike on live rock, as you have just experienced.