If you're keeping any of the typical FOWLR fish, some of them may eat the growths.

You may find this interesting. I put a rock with some of that stuff in my tank with the new Three Spot Angel, which is a sponge eater. He does not pay attention to it. FYI. :eek:

After more research, I think that it is not Haliclona sp. but more like Leucosolenia sp.

http://www.biosci.ohiou.edu/introbio...ucosolenia.htm
http://images.google.com/images?hl=e...ia&btnG=Search

Bob_I, AJ_77, monza, dirtyreefer & teevee; Thanks for the feedback. It has given me some ideas about how I want to proceed from here.

The photo I uploaded was from my feature rock which is 22" x 10" x 10" weighing approximately 40 lbs. That is going to be in my main display, so the sponge has got to go.

Some of the smaller rocks with sponges may end up in my sump, maybe the biodiversity will be beneficial. I can deal with it there.

Thanks again. I'll let you know how my experiment works out.