Unkown growth on live rock

[Odie]

This growth was on a piece of live rock I got from my LFS. It opens and closes the small hole in its center and has other small holes that open and close. The circled hole is the largest of its holes. Does anyone know what this is? Should I be concerned with it? It has been in my tank for 2 months now. It is neet to look at and would like to know what it is. Oh yea, it's tecture is hard to the touch.

[Parrothead]

try looking up tunicate(SP?) or sea squirts, Just guessing but that might be a good starting point

[bautiSTUD73]

kinda looks like a barnacle, i have a rock with like 5 of these ive never seen them do anything. you should be fine

[twisted]

my first thought was a wierd sponge, but could be a tunicate i always thougt they were more bulbetous.....is that even a word?

[Odie]

Thanks for everyones input. It is a strange looking thing isn't it?

[Ninong]

It's not a tunicate.