I have a 29 gallon reef tank with a few corals in it. But they all died. My water quality was just about perfect except for a little nitrate and phosphate but nothing too high. I have a power compact light with 2 65w 10k and actinic bulbs and I don't think there cutting it. I'm thinking of upgrading to 175w metal halide with 2 65w actinic retrofit kit or 6 t5 bulb kit. Which would be better. They are both about the same price.