Maximus
Fish Herder
You'll want to stay away from any rocks that have obvious metal deposits, any that look like they have rust on them (a good sign of metal), and anything that has a tendency to flake (not harmful, but makes a big mess). Other than that, you can use just about anything, limestone is especially good as it will help buffer your water.
Thanks alot for that
There's a few that I've had my eye on, but the one I want the most has a rusted look to it, with evident layers of different colours.
I managed to snap a quick pic on the way past, and yes I got a few strange looks for this
I'll post it up in ten or so minutes, so watch this space
Cheers,
Maximus