Originally Posted by AquaRick
There's no telling what type of phophate and other junk have been absorbed by the concrete. Best to get some new base or live rock.
I found Someone on cl
that is parting out a tank and is asking 250 for 100lbs. I'll see if I can get it to 200. Not a bad deal... Or there is this company holeyrock.com, if you send them a pic of what size and what you would like your aqua scape to look like they will piece it together. And it only costs $79.00 per 50 lbs delivered.