Hi Mike,
Sounds like a reef aquarium setup?
Those will run great with 4 1000mA BuckPucks and a 24V power supply. Run 5 of each LED per BuckPuck and assign two BuckPucks to one PWM pin so they function as one channel, and the other two BuckPucks to another PWM pin. That will give you a channel for the blue and a channel for the white.
Cheers!