Well I dont think ive honestly ever seen granite in a tank, that im aware of. but im guessing its more like big round stones. then id say texas, especially for a tanganyikan tank with rock dwellers they love dipping in and out of the rock work. I was concidering texas in my tank also, but there is none to be found around here and I was just diggin the lace a little more. but you will be happy with tex.