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a larger tank is better because it allows for a little more room in terms of water condition. Think about this, a piece of uneaten fish food decaying in a 20 gallon tank will affect the water much more quickly (and, more potently) than that same ammount of food in a 70 gallon tank.
It depends on what you're looking at doing with your saltwater tank that will also determine the ammount of live rock you'll need. If you're going with a fish only, technically you don't need any live rock as long as you have strong enough filtration. A fowlr (fish only with live rock) will sort of be in the same boat, but obviously you'll want enough live rock in there to allow the fish to hide and to be esthetically apealing. If you go with the full out reef tank, I would suggest anywhere from 1 to 1.5 pounds per gallon or more. For example, my 90 gallon will eventually have upwards to 135 pounds of live rock.
As for sand, it depends really. Gozer reccomends 1 inch (he helped me ALOT when setting up my tank, so I can't take all the credit) if you were looking for a shallow bed, or 4 inches if you want the deeper bed. Keep in mind that with sand, detritus settles in, and withouth proper aeration and bed movement, becomes factories for nitrite..or nitrate, I can't remember right now. Anyways, I've chosen to go bare bottom. Its easier to clean, allows for more tank rotation without causing a sand storm in your tank, and frankly, allows me that much more money to put elsewhere in my tank.
best of luck!
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