How Long for T5's?

[atwinparadox2]

How long should I leave my T5's on for?

4 x 54 watt 48" retro. Icecap 660 Ballast

Thanks

 

[iceman79]

anywhere from 8 being the shortest to 12 hours of light and also depends on whats in your tank if you have mostly softies you can do 8 but if its mostly hard corals i would do 12 or 10 hour periods i do 10 i have a mixed reef tank