How much sand?

For a 1 to 2 inch sandbed, about 1 to 2 lbs per gallon in a standard 55. You don't need to get live sand -- you can buy dry sand and save yourself some money. As to the color, that's up to you. It's all personal preference. For large tanks, I prefer white sand just because it looks natural. But in my smaller tanks, I have used black sand and liked the way the corals' color stood out.
 
I didn't like white in my first tank since it didn't stay white, always looked dirty. I did a mix of white and black sand in the tank I have now and really like it. I think of it as getting a multicolor shag carpet for your living room; it doesn't show dirt as easily.....
 
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