Help w/ lighting

[dekon70]

I have a BC29 w/ a Sunpod 150W MH light, is 10-12 hours of light to much? There are mainly SPS corals in it. Should I cut back? I keep the moon lights on all night and put the blues on for 2 hours before the MH come on and also 2 hours after the MH shut off, is this OK?
TIA

 

[peef]

I would say you are fine, maybe. So with the lighting schedule as I understand it you have...
2 hours actinic
10-12 hours MH/actinic we will call it 12 though
2 hours actinic
=16 hours total light time.
then night time. That might be too much if I have it right. What you should do is 12 hours total light time.
2 hours of actinic (sunrise)
8 hours MH/actinic
2 hours actinic (sunset)
= 12 hours total. Your night cycle is just as important (almost) as your daylight for some corals.

 

[dekon70]

Thanks peef,
I thought I had to much light time. What you said makes more sense. Do you think I should keep the blue LED's on while the MH are on?