Don't buy all live sand such as 'ocean direct'. I would do mostly dry sand (much cheaper) and about a bag or so live sand to get you going. It will all become live soon enough. I used a carribsea product called flamingo reef. It is similar to their special grade in grain size, just a little pinker. I went from the sugar sized to this in my new tank to avoid it from blowing around as much. With a DSB
you could do half and half fine grain and coarser sand if you wanted. The coarse will settle up top to be less prone to blowing around while the finer grains will let in less light and have more surface area for the life needed in a DSB
. Hope this helps.