Importance of Sponges in a reef..

[msjboy]

I have a lot of sponges that from somewhere, came alive over the last of year especially. I think it was probably from a dorminant state/spores that come on the liverock I got. They are black, green ( ones in the dark sump) and pinkish... I did add a couple of small pieces of blue sponge but they have not grown much at all but still alive after 2 years being bought. It really depends on what tank/its setup you have in order for sponges to come alive or keep ones you bought alive.