ID Please

[RockyProndoa]

Hello all:

Found this in my refugium, curious as to what it is? I am referring to the white "tree root" looking growth on the right side of the pic growing off the coral skeleton.

 

[Mcgeezer]

Sponges are common in refugiums. That would be my guess.

 

[RockyProndoa]

Hmmm... Looks like it could be. Anyone provide a positive ID?

 

[Sugar Magnolia]

Yep, sponge.