Sponge ID (I think)

[Lowefx]

So just doing some tests and notices these spike looking sponges under this rock that ice had for many years. Any thoughts?

 

[Crabs McJones]

Yup, it sure is

 

[Lowefx]

Yup, it sure is

Do you know what type or name?

 

[Double monti 61]

Nice tank

 

[Crabs McJones]

Do you know what type or name?

It's a type of encrusting sponge

 

[Lowefx]

It's a type of encrusting sponge

Not the blue-ish sponge. I'm talking about the white hair looking stuff, pointing down.