I used 40lb Carib-Sea Oolite, 40lb Carib-Sea Reef and 30 lb Aragamax-Live on top.
I thought about the Home Depot but couldn't get the carbonate based sand here anywhere as all the play sand they have around here is silca based. They say you can use it but I didn't want to as it is non-soluble and doesn't provide the buffering that carbonate sand does. This solubility is what they refer to as dissolving, though it doesn't disovle per se but actually shrinks.....sand beds need to be replenished due to this shrinkage over time. Besides it is a good thing to add more live sand occasionally to reinoculate your bed. Keep it stirred and you'll be fine. I put my live rock in and it was cloudy, within 24 hrs it was crystal clear. The bacteria on the rock weigh down the sand particulate in the water.