ID HELP

[MERKEY]

I didnt know if this was good or bad but also didn't know if it was algea or not....

It is not in my tank but a fellow reefers.

I have never seen it before and can't find anything about it.

Anyone got any thoughts?

 

[sixty_reefer]

It’s very sea pen looking, my gut feeling is telling me it’s some kind of a sponge