I have lots of nice rock that I just took out of my display tank.
It has undesirable macro algae on it and needs to be cured without light for 6 weeks (according to Ace and Kristy ;) ) to get rid of any traces of macro algae.
I purchased this from Marco Rock. It is the Signature Fiji rock, now banned from import. Here's info on it:
http://www.marcorocks.com/index.asp?...PROD&ProdID=40

and here's my tank with it:
http://maast.org/forums/showthread.p...ight=evolution

I have a medium (15 to 20 gallon?) tub filled to the top with this rock. Probably plenty of rock to stock a 30 gallon tank.

I was going to cure it myself and then add it to my sump but the kids keep trying to get into the tub messing with the 'no light' part. lol

In perfect condition this would be about $50 worth of Signature Fiji rock. Since you need to cure it I am asking $25 or I will take interesting stuff in trade.