could that be a peice of montipora by any chance?
Looks like a monti to me. Is it hard?
I'm thinking a encrusting montipora
It seems that you guys are in agreement it does look similar to the pictures I googled. Now the question is what do I do with it. I did have it near the bottom and over the corse of a month I moved it to the top 1/4 of my tank. Is that good? It has light flow I have 8 t5 lights and finally do I glue it?