+1, I know you mentioned either white or pink, but I'd suggest checking out some of the natural browny coloured sands, would help towards hiding the crap that gathers on top of sand. Though this is easily offset by regular gravel vaccing if you aren't lazy like me.White substrate gets pooped on. Poop is brown. You then have brown substrate. I wouldn't worry white vs off white.
Sent from my iPhone using MonsterAquariaNetwork app