A very strange, very different type of sponge.

[Anonymous]

I'm 95% sure this is some type of sponge. This is just the end of it. It is secured to the rock with a very small "foot", for lack of a better term, as you would see in a gorgonian. The base has around 3 tiny holes in it, and it sends out a long thin branch like this. There are several in the tank, this is the longest one. It grows very fast. Anyone know what it is, or have anything similar?

 

[Anonymous]

I've seen it come in on corals before, but as for an Id, dunno. It does grow fast, and comes in several colors.

 

[Anonymous]

It's easy enough to prune, but I've noticed it makes polyps retract when it comes in contact with them.

 

[liquid]

I've seen them on rock and macroalgaes at Harbor when I was there in the past. That's about all I know.

Shane