Johnny -
Welcome to Maast. As Josh mentioned, it is beneficial to have a good mix for your substrate although many people go with the oolite (sugar-sized) only sandbeds. When I was setting up my 58gallon, I mixed 60lbs of the oolite sand with 30lbs of the reef sand (think it's the same as what you got). The one thing I noticed is that even though I mixed it thoroughly, the oolite sand has settled to the bottom and the reef sand has of course risen up. Nothing bad about this, but with the larger grain size, you have to be careful what livestock you add. Animals like sea cucumbers and blennies that take in sand through their gills to filter feed will not do well with larger grains as it will scratch their internals and an cause infections.