I have a 75 with a jack dempsey in it. When he swims towards the middle of my tank and under my lights he turns blue and all iridescent. I have two t5 bulbs in a single fixture one is 10000k and the other 6500k. How can i make it so that he is under the light more often? Should i buy another fixture if so what bulbs. Or should i just replace the 6500 with another 10000k. Please let me know what my options are so that he can look his best.