I am as some of you are aware starting to set up a 29 gal. I have a 175 watt medal halide and 72 watts of power compact. The lights will be installed in a wooden canopy. Will the heat from the lights raise the water temp? The canopy is mostly open on top so some heat will be exhausted there. Wondering what you all think about if the tank tempeture will go up. I am thinking about doing a 20 gallon sump, would that be enough to cool things down. I know I probably don't need a big expensive chiller, just wanting to she what everybody thinks.