Light schedual

[katsafados]

I was wondering what was the bare minimum time the light has to be on each day?
I have a 10g with 150watt MH (3 sps corals, zoas, shrooms, xenia, favia, kenya, blastos)
I'm getting killed on evapouration, I loose about 5gallons per week, and no I do not want to put a cover on the tank.
Just need to know what the bare minimum light schedual I need to house these corals.
Thanks

 

[flower]

I think 6 to 10 hours I believe.

 

[acrylic51]

I think you could get by with 6.....Most people overlight or expose their tanks anyways with direct light. If you think about in nature the reefs aren't exposed to direct intense light consistently......