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Two 250's would cover the tank better....as to the color temperature...are you going to be any fluorescents to supplement blue (actinics). The lower the kelvin, the warmer (yellower) the color. I know "yellower" isn't a real word lol. The higher the k the more blue the color will appear. If you aren't going with actinic supplementation you might want to go for 20K bulbs.