Help with an ID please

Hey everyone I'm having some pretty weird growths on one of my rocks that has now spread to form another colony on the other side of the tank. It's translucent/white and looks like an encrusting sponge that has the shape of mountains.

 

Wow...wild little mountains. I use to take a sample to the University labs for definition of the growths. Most local universities have a marine biology dept. that are more then willing to study new growths. It makes for a good PR with the local proffesors and adds to your needs for study. Have you drop over to your LFS for some possible answers?

Nice crystal mountains, I would nip it as soon as possible, before it might kill off something more valuable in your tank.

Good luck,

Maximo

 

Is it hard or soft? I have had sponge grow behind my rockwork but not where there is much light. looks like some sort of algea from the pics I cant really tell.