Hope this doesn't get me banned but has anyone tried kitty litter for a substrate? I thought of this originally just being a smart azz but apparently ppl do this! So, I was wondering if anyone tried it and how it worked out for them. I've read the best (I guess) is Special Kitty Litter from Wal-Mart. Although, eventually it degrades and makes a "frigging mess" after about a year or so. I can only imagine trying to clean out the bottom of an aquarium when you change it (have to blast it out with a hose). Clumping litter gets so hard that I can't imagine a plant being able to grow in it.