Blue are important part of your lighting for coral health and for visual appeal. Blue make the ramp up/down more realistic. Everyones photoperiods are different. Mine is as follows;
12 hours on/ 12 hours off
9am blue leds on
11am white/actinic t5 on
1pm full spectrum leds on
3pm white t5 off
5pm actinic t5 off
7pm full spectrum leds off
9pm blue leds off