Blue encrusting sea sponge?

I seen this today, I am sure its blue and thats about it, I was thinking Tunicates or Sponge, but not sure of either, it is gooie, gooy, looks like glob, pretty neat whatever it is cus I love blue.

 

My bet is on sponge.

Might be a Liver sponge, but they are more black than blue.

Could be my very favorite blue sponge, can not remember the scientific name. They are photosynthetic, requiring a ton of light.

Live Blue Sponge - Blue Sponge - Saltwater Reef Invertebrates

Probably thousands of different types of sponges.

 

WOW! I like it, very well could be that Blue Sponge in an early stage, bad thing it is in a location where it won't get full use of the MH lights, thats the 2nd hitchhiker I found on the same rock, I have this colony of some type of small zoa on the same rock along with the Yellow Polyps that I bought. I sure will keep an eye on that.

 

they are nice looking sponges, here is the one i have in my tank

http://www.3reef.com/forums/id/blue-sponge-100757.html