Help on i.d. good or bad?

[Ocean_View]

Hello all, looking some I'd on this purple sponge looking growth in my tank. Was away forb3 months. Came back tank full of GHA and this growing on rocks. Any help be great..

 

[bradleym]

I'm pretty sure it's a normal purple sponge. They come in a lot of different colors.

 

[Cell]

Sponge