Any t5 lighting for an 18" cube

The problem is the bulbs. Good luck finding good bulbs at that size. I would recommend you just go MH.

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I would personally recommend a pair of A160s, pointing down, slightly toward the center, slightly toward the rear. Just my opinion.
 
T5 over a 18" cube can be done but its wasting the full potential of an ATI/Giessmann 2 foot fixture due to light spilage. Best option would be metal halide like Cabo Sun or small Cayman Sun with 250 watt radium hanging .
Depending on the place , you can achieve cooling by normal multiple fans on the sump ...
 
A bimini sun with a 250W Radium or whatever won't be too much heat. Hell it's not like the fixture is going to be super close to the water anyway.
 
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