Quote Originally Posted by alton View Post
I agree with Eric on the 6 lamp. I have a 4 lamp fixture on a 40H 36 x 12 x 20 high with a 5" sand bed and it looks fine. I think you will need the extra two lamps to cover the additional 6" in depth.
I am going to have to disagree with the 6 lamp idea. I am only running 4 lamps on my 75 and am having no problems at all keeping multiple SPS species at varying depths in my tank. I even have eggcrate on top to deter any jumpers so that is cutting down on some of my light as well. With the 40breeder being less deep than my 75, 4 bulbs should be plenty. One thing to keep in mind though is that my 4 bulbs are overdriven by an Icecap 660, but I still don't see any issues only using 4 on your 40.