I was out walking my dog through the paths in the woods behind our house and was seeing all these big rocks and ended up heading home and grabbing some bags and collecting all the rocks. So after scrubbing them in cold water and then hot water and then boiling them and letting them sit in hot water after that, they are now in the tank. I really like it, I kind of want to find more rocks to add to it a little but for now. I really wish I could do real plants in it but I know Hedwig (my oscar) would be ripping them out all the time. Ignore my cat in the one, he loves getting in the way of everything you try and do. I will be getting a black background in the next few days so it will look much better then, no cords and orange walls.