I just installed a new tank with Qwikrete medium grain sand , it is kiln dried and 100lbs for 7.50. And white.
QUIKRETE® - Sand - Commercial Grade
Wash, wash, wash, wash, wash, then wash some more even when the water looks crystal clear!...
My friend did hers as well was both were a little cloudy but within 9 hours when I had got home from work it was all clear! Hers was the same. Looks nice you can see the tank on my profile, I think.