What do you guys think about using limestone live rock in a tank. I'm not advertising but this is a guy i met in the keys and he was offering me this rock for 2.50 a lb. http://www.liverockusa.com/home.html Anyway I was reading on their site and they mine limestone and have had a lot of it in their plot in the ocean for about 10 years. It is full of the algae of the area, which i saw tons of it around there when diving. I just dont know if I'm going to have stability problems since its mined on land, well, i think it is, i guess it could be some ancient dead reef that they got it from but I am not totally sure. Anyway just wanted to know if you guys thought it would be ok. They do have a really nice setup behind the store, they pump water into their holding tanks from the ocean and let it drain right back into the ocean constantly. Thanks a lot!