I am trying to build a real rock aquarium background. I made a separate topic for that. I'm also trying to rescape my tank right now as it has a mix of a whole bunch of different rocks and it looks horrible. There's lava rock, some kind of slate or shale, some kind of sandstone, and some more disgustingness. I would like to replace all of these rocks with one kind/color. Anyone know where I could pick up close to 120 pounds of large, relatively stackable rock or just boulders to fill my 55 gallon? Ideally, it would be free, but I'm fine with paying about $0.20 a pound. Something like limestone would be nice. Is it legal to pick up those boulders/large rocks that fall from bluffs near the sides of roads? If that's illegal, I live within 5 miles of the Missouri River and there's a 230 mile trail that runs along bluffs pretty much the whole time. Am I allowed to pick up the rocks from there? BTW, I'm talking about the KATY trail in Missouri. Any help or advice will be greatly appreciated.