I have been looking at the 400 halide as an option for lighting on the 60 cube. I have only ever used 250s so i am not familiar to the heat the 400 produces. My question is on a 60 cube with 10g sump and 10g fuge what type of water temp issues might i come to expect? Is this a reasonable option or am i just toying with the need for fans and maybe chiller? Please post your experience with 400halides on smaller systems. Oh also the cube is open top, no canopy.