i have about 80 lbs of nice mature rock for sale. most has been in my system for ~3 years. it's a mix of fiji, tonga branch, and there's a few nice shelves. there's a couple of large rocks(~8-12lb) and alot of medium(~4-7lb) chunks, also quite a bit of rubble that's great for making little mini fuges out of your overflows. $2.50/lb