How long should lights be on

[MissNano]

So i have never been told, so i was wondering how long should your tank lights be on in a day? Does it matter?

 

[Bifferwine]

You want to try to mimic nature. So you want lights on from 8 to 12 hours a day. Less if you don't have corals.

 

[dcantucson]

I run mine about 12 hours a day.

 

[VAreef]

I run my actinics 10hrs and MHs 8 hrs.

 

[Rcpilot]

Lighting schedule on my 29g frag tank

(2) 65w PC - one actinic and one 460nm
(1) 175w 14k MH

Actinics ON @ 10am
MH ON @ 11am
MH OFF @ 5pm
Actinics OFF @ 6pm