So I'm waiting to buy a house in southern New Hampshire as soon as something decent shows up on the market. Anyway, I am making preparations to upgrade my 15 gallon nano to a real tank. I am trying to get most of the equipment together for the tank so I can set it up to make a smooth transition when I do the transfer. However, I'm stuck on the tank size. I have been looking at the Seapora Edge 75 gallon and 80 gallon. I know that I want a 4 foot long tank anything larger would cost too much with everything I would need while trying to buy a house. This will be my main reef tank. So the 75 gallon is 48x18x20 and the 80 gallon is 48x24x16. Is a tank width of 24" that much better than 18"? If so is 16" deep enough or should I look at a 90 - 120 gal tank? I need to add that I got a quote from my LFS for the Seapora Edge 75 @ $399.99 (it is the non reef ready rimless) so I'm guessing the Edge 80 would be no more than $450. If I do look for a bigger tank is there anything that would even be remotely close in price? I appreciate any advice!!!!!