I used Reefflakes and its amazing .. miles better than Caribsea and doesn't get blown by my tunzes and gyres.
However, I would do barebottom unless you are like me and the most prized possession is blue star leopard wrasse and soon to add H. Iridis or melasmapomus who absolutely need sand ..
But my love for sps is only trumped by my wrasses
Regards,
Abhishek