Ok, I'm new to the saltwater side, I've had a couple fresh tanks before, so I know a LITTLE about keeping fish alive, but one thing I'm looking at now is to try my hand at a reef. I see 58g reef ready tanks for sale online, but am wondering the big differences between those and a normal 55g tank. (other than the obvious 3g, and the price.) My friend has a 55g that he's been using for freshwater for sale w/ a stand at a good price, and am wondering if it's worth going with his or worth making the investment for the reef ready.