Sponge?

[4kidsandapug]

I’m certain this is a type of sponge but unsure what category to place it. I have a few around the tank but this is the biggest by far- actually quite colorful, white with almost a green/purple pearl sheen to it. (Hard to see in the pics)

Any help would be appreciated.

 

[Billdogg]

Probably a sponge, but it could be a colonial tunicate as well. Either way, IMHO, a very cool find!

 

[4kidsandapug]

My google search was unsuccessful.