Black sponge

[Charlesbrooks]

I have this black sponge that hitchhiked onto my rock. Should I keep it?

 

[Lionfish Lair]

I would leave it be.

 

[Charlesbrooks]

I would leave it be.

Thanks

 

[Duraticate]

It will grow some nice features

 

[Charlesbrooks]

Mine feels hard, and smooth to the touch. Is this normal?..

 

[RFLKPTR]

Nine years later, and I'm surprised nobody commented on the above admission.