[Myka]

I made a reply a couple days ago right after dreef's post. Mine disappeared. Weird.

The base rock that you get at J&L, the Caribsea Reef Rock is actually fossilized coral, it is very heavy and not particularly porous. It is not a very good base rock.

What my original post said was that even though the bacterial colonies will be a bit diminished in rock that has been cooking for a long time, there should be very little if any nitrate and phosphate leeching from the rocks. Test the water it is in before you buy it to make sure. It will also take a little while for the coralline to come back. Otherwise, I would jump on the opportunity to buy rock like this, it is awesome rock provided it tests out right, and was properly stored in saltwater of the proper salinity with a powerhead and heater of the proper temperature.