So I recently had a mishap with one of my 250 watt fixtures on the 450 but I have been thinking about redoing the lighting anyway. I was running 4-250 watt Phoenixes on the front and back of the tank and 2-400 watt Radiums over the center. I could continue with this scheme, but I also have 3-400 watt Radiums and 2-250 watt Hamilton 20000K mogul base fixtures laying around that I could use. For those that don't know the tank is 4'x6' and is 30" deep. Let me know what you think.