Originally Posted by Noahma
What kind of rock is it?
Great question. I'm not geologically inclined in the slightest and have no idea. Two different types... The first is jagged, gray, pre-river river rock (i.e. rolled off the mountains and down to the Poudre, without going in to get smoothed out). It looks good in a jumble, and when I kept loaches they loved the hell out of it. The other type I got free from a local landscape supply yard (the guy laughed out loud and told me to just take it when I told him how much I wanted) - more rounded, dark gray, with some white and red areas.
I'll get some pics posted when I have a chance...