Tunicate?

[cperry7467]

I picked up a Monti yesterday and when I went to put it in the tank I felt this underneath. Feels like a leather coral but since it's growing underneath I'm guessing it's a tunicate or sponge? Never had anything like this before if someone could help me ID. Next question is any suggestions on how I mount the Monti without super glueing and kill this thing? I'm guessing the Monti will eventually encrust and close this thing in and it will eventually die.

 

[saltyfilmfolks]

Sponge.
The sponge will likely grow back.