PERSONALLY, I love the color of the T5's and the array of choices there are in colors and such. Much preferred the Tek to my MH. Also less heat to worry about. And with only 18" depth I think you would be happy with T5's...
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Red Coral Online Store 
www.redcoralaquarium.net
45 Gallon Cube with 10 Gallon Sump, Lighting 8 bulb T5, Vertex IN 80 Skimmer
-2 Occelaris Clowns, Engineer Goby, RBTA, Peppermint Shrimp
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