I think that's pretty much all the same info I've seen. I don't want to deal with sand, until I get into marine tanks and/or puffers. Meh, I need a digital camera, that way I could post gravel pictures and be sure which was best for the cories out of the options. The LFS, should be able to tell me the smoothest gravel? Can you post a link/picture of acceptable gravel? Would the use of glass rock as an ornament, be something too sharp and that should be avoided with cories?