I'm planing to change my gravel substrate into sand, and I wanted to ask which size, and colour sand is the best for cichlids, my local fish store has only 3 options (0,1-0,3mm white, 0,4-1,2mm white, 0,8-2mm brown). Also which one is easyier to maintain? Been keeping cihlids for a year, they like to dig all the time, but I see that they dont like gravel

Ty for advice guys.