Since I have a fish only tank I am running two flourescent bulbs. Wattage is only 40 watts per. I cannot put stronger lighting due to the temps in the tank will rise ( chiller not an option). Now I was wondering what Kelvin degree would make the colors look more vibrant. fish colors consist of yellow,blue,red,orange,black,purple. I have currently a actinic and a 10,000k. what mixture of K's could I put together, I tried a pinkish looking light and I like the yellow and orange under it. Give me clues as this is a fish only tank with low watt lights. Thanks:question: What result's could I get out a 20,000K 40 watts over a 10k. Any input