I've been wanting to put some rocks in my aquarium for some time now. I was going to take the easy route and buy some from the lfs but none have looked natural enough for me. I've been keeping my eye out for good rocks wherever i go. I found a huge supply of rocks a couple blocks from my house. They look perfect for the look i want. The only problem is i don't know if they are safe to use. I wish i knew how to identify rocks
. So i need some help. I was thinking maybe everyone could post about what rocks are safe and maybe post some pictures of them.