I had red bellies and I had black gravel for them. It brought their color out, I thought so anyways. I have a golf spilo now and I dont know if I am not noticing his gold because I still hae black grvel or because he is only like 3" and he hasnt begun to show his gold yet. I can still see the black spots clearly on his body. Whats going on. SHould I change the gravel color to make his gold come out more and if so what color would be best???? Personal experiences would help.