Hi, I own a company Sensa-Light Ltd. We do custom lighting. The LED set up you have looks good, but it looks like you have good heat dissipation from the heat sinks. If you can hook up a "K" probe ( most cheap ohm meters will have or use one) and test the heat you may be able to forget the noisy fans.
I am using 1 watt lumileds in blue and white combination to get about 14,000k
I think I have about 30 LEDS on a 55 gallon tank. The home made unit does not need any fans. Good luck, if I can help let me know, Don
