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Ok I have a friend thats willing to sell me a 400 wt metal halide w/ ballast retro I have 2 96wt actinic.. Will this be sufficient for a 75 gallon tank or do I need 2 400 wts??? I figured I can place the one MH in the center of my canopy and one 36 actinic on each side... Would like let sps live??? Or do I need like 2 x 250 wt MH??? I can get this for 50 bucks without the lamp its 20k. Let me know what to do. I dont want to waste money on something I dont need and also how many fans do I need to cool my canopy with this my canopy sits about 6 or so inches off the water do I need to raise this?
 

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It should be good enough to keep sps. I had 1 400 watt over my 90 for a few yrs and kee sps with no problem. The only thing is you might a some slight shading in the corners about 3" on each side, but if you van live with that look you will be fine.
 
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