I mixed 2 parts black sand and 1 part white sand. My stingray loves it and i think it looks great! The only advice I have is to rinse it really well, because small pockets of air in the sand when it is added to your tank will cause grains of sand to float.
Christopher, I love your mix. I wanted black sand for my next tank that's going to feature my black ghost knife. But, of course the black would not work, but your nice mix 2 parts white to one part black, might just be the thing. Nice.
Thanks for the compliments. I was hesitant to mix colors, but the LFS only had 2 bags of black. I am really glad that I did mix, because it gives the tank a unique look. I laid my sand really thin, so it only took 3 bags for a 75 gallon tank.