Lighting for a new 90 gallon 36x24x24 tank

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I already own a coralvue 400 watt ballast reflector and bulb for my 2 foot cube, I am wondering about opinions for alternative reflectors and t5 supplementation that would work for a 36 x24x24. I dont want to buy any extra metal halides but am prepared to swap reflectors and get some t5.

I was thinking 2x39 watt t5 retro and a large lumenarc would work, any opinions welcome.

Thanks