No problem. I found a few different lights, but they measured 12 inches, so you'd need some sort of top or a way to hang the lights. Prices I saw were from about $40-$60. I just looked at CF to get an idea.
Check out hellolights.com. I don't think their prices are the best you can find, but they have a big variety of saltwater lighting, including some nano stuff. Nano-reef.com is inevitably a good source of info as well.
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Current setups: 1800 gallon koi pond, 10 gallon planted, 150 gallon reef, other FOWLR tanks