For a bigger sump, you might try going through the top of your stand if possible. I have a 30 breeder which is just a couple inches shorter than the 40, and I use a 20L for a sump, but I had to put it in through the top of the stand before putting the main tank on top. Luckily, I can get my skimmer in and out through the front of the stand. I run 2x150w MH on my tank (36x18) and I really love the look. I know it seems like overkill, but for some reason, my tank has a center brace. Anyway, just some thoughts for those of you setting up 40 breeders. I'd love to see one with t5s; I remember when t5s first became popular, a lot of people were using the 54w bulbs on 4ft tanks and having problems with sofites dying and sps corals bleaching. I wonder if the 3ft 39w bulbs have the same problem or work any better???