actually that rock was live rock that had been cooked that came from a friends tank that had crashed I have had the tank(s) running for about 2 yrs now it has been thru many upgrades then down grades and now on the way back up I plan on sticking with this one for a while this time the bow front has been up and running now about 3 months but everything that is in there has been transfered from other tanks that have been up and running and believe it or not that 10 gal had been up and running for almost a yr but like I said most of the rock that was in there had come from the firends tank.