special grade, fiji pink and bimini pink is all very nice sand. I use the Bimini pink for mine. It has a bigger grain size and a little pink mixed in. Go with the 1lb per gallon rule with sand. I also agree, don't rinse it. Even if there is dying organisms in it, it will help kick start your cycle.
My tank has similar dimensions as yours. One 40-lb bag of that sand will make a 1-inch sand bed.
So far I like this sand a lot better than my old sugar-sized type. It doesn't fly around, and if it does, it settles very quickly. Water quality is clear.
I would go one step further. Soak the sand in RODI water and do a 100 percent water change daily. Test for PO4 (phosphate) daily, when it gets down to zero it is ready for the tank. This may take a few days to over a week to accomplish. Believe me it is WELL worth it!!