Depending on your electronics knowledge you could hook up a Arduino and control it with custom programmed pwm signal's.
I've seen something called BlueFish Led Controller that could do what your asking in a bit more of a pre assembled package. https://aquarium-led-controller.com/
Have a look into ReefPi (here on R2R) some people have used it to control black boxes quite cheaply. It takes a bit of electrical knowledge but the guides are quite good and if you can put in a little bit of time to learn you should be able to do it with no prior