help I.D. please

[freshbutsalty]

hope you guys can help i.d. what else came on this mushroom rock that i got in the mail

 

[Max]

Not 100% sure but, I would say the yellow stuff is sponge. I couldn't say about anything else.

 

[freshbutsalty]

thats what i thought it might be, the photo is hard to tell but their is also some black/gray suff on it that i have no idea. Its a cool rock just have no idea what 50% of it is. Thanks for you help

 

[cpn_aaron]

I'd go with sponge also. I got some Figi live rock in before that was covered with a red variety of that sponge.