My Radiata Lion is almost transparent when the lights are off but when thier on is an almost neon pink,
I think if the fish are showing no other signs of stress and your parameters are ok. then you have nothing to worry about.
I agree with blinky put a timer on the lights, i set mine to come on at about 4.30 pm (home at 5) and it goes off around 12 (bed time) they dont need to mimic the actualy day / night times as long as they have a set day and night.