I am upgrading my 29 Gallon reef to a 75 gallon. I am ready to upgrade the light on my 75 gallon tank. I currently have a 2 x 65w light on my 29 gallon tank. I currently have mushrooms, candy cane coral, pulsing xenia, star polyps. I was trying to decide between a 4 x 65w or Metal Halide 2x...