lighting

[My Coral Reef]

i have a frag tank 72x28x12 i have 2-250 watt mh in mid of the is a little dark i was thinking may be a 400 watt mh on a like mover what do you think

 

[mr_X]

12 deep? i don't think you need a 400 watt halide. i'm not understanding what you are asking though. try using punctuation and typing full sentences.
i'm guessing you have 2 x 250 watt halides over a 6' tank. the general rule for halides in spider reflectors or similar is 1 lamp for every 2 feet of tank.
you would need 3 lamps total for this system.
i would think a 400 watt halide would burn corals under 12" of water

 

[Brshriver]

Higher wattage will not help.

You need three reflectors. Lumnebrights will give you incredible par. Lumenarcs are good too and will be plenty of par for a tank that shallow. Don't use 400 watt on a tank that shallow. It is a waste of money and may fry your coral.


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[Keiki]

What about T5s? They would work great on a shallow tank like this.

 

[luke33]

For a 6' tank mh's are much more economical and easier than t5's. Like everyone has suggested your going to have to bite the bullet and get another mh on there. Or you could use the light mover with a 250w mh.

 

[Brshriver]

Or play with a small diy led project to cover the dark area. You could compare growth rates with different lighting in your tank.


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[Eggs]

12" depth, I think you could go to three 175 mh

 

[mattmike]

+1 on the three 175 mh with nice reflectors.