Ok, I'm new to the group and am going to be getting into the hobby. I plan on going with a tank somewhere between 75 and 120 gallons. Question is, do I buy everything new, or if I find the equipment used, go with that? Also, is it a good idea to look at buying a system that someone already has up and running? One that comes with all the fish, corals, live rock, etc.? I know that's what my wife is gonna want to go with as she will want the tank running asap. Any suggestions or comments will help this newbie! Thanks!