I've only been keeping fish for about 9 months now but have , from the very start, always aimed for the natural look. My first small tank has sand, bogwood and live plants and the subsequent tanks have just become bigger and bigger versions. I did try black gravel at one time, but I'm going back to sand. I think the fish like the natural, slightly wild environment with all the nooks and crannys and I certainly have lots of fun exercising my creativity - its like underwater gardening.