I'm in the process of setting up a 30 gallon. I'm trying to make it all as cheap as possible. When I looked at gravel at the LFS they wanted 25 bucks for 25 lbs of gravel. That's absurd. Petsmart wanted 12 bucks for 25 lbs which wasn't too bad. However I got 40 lbs of gravel from lowes for 3 bucks! The gravel has varied sizes of stone and different colors, but for the most part it will work good in the new tank. All the gravel is round and doesn't really have to many sharp edges at all. I can't wait to get the stand built and see it in the tank. Just thought I would share the gravel story with everyone! Has anyone else ever bought gravel from the hardware store?