01-01-2013, 07:56 PM
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Hey Willow. You would need at least 1lb ber U.S. Gallon for a fish only tank, and up to 2lbs per gallon if going with a Reef tank.
Now, its cheaper to go with 1/2 n 1/2 rock and LR. You can do what you want here. With the Live Rock you get some really neat critters and Corals, but the down side is, you may get some really bad critters that are hard to remove from your tank. So you can go with all Macro Rock and be no worse for wear, no neat critters, but no unwanted headaches either.
I woukd recommend no top, as you gas exchange is much better, and the light is not restricted at all. Exceptions would be, if you plan on getting any of the known jumpers out there, of which there are a few. If that's the case I woukd recommed haveing a sump, then you will still have good gas exchange from that stand point.