I currently have a 10 gal nano going for the past 9 months. All is well and beginners luck is what i call it.
I have two fish in mine, a tomato clown and a green chromis, along with a camel shrimp, two small hermit crabs and a turbo snail. If I were doing this again and wanted fish I would strongly go with two percs. There is nothing wrong with the fish I have but the chromis do like to be in schools of their own kind. The clown and the chromis really get along well and are so funny. So it is possible to have two fish like the percs.
I also have lots of rock and mushrooms and xenia too. My lights are the screw in 20 watt 50/50 powercompact coralife flourescent bulbs. My hood is an incandescent and this is the only type of lighting I can use without changing my whole hood. But for more harder to keep corals you would definatley have to use a different light setup. Many marine people use the 96 watt strip light in their 10 gal nanos.
Mine is just fine for what I need and want. Now keeping this size of tank balanced is something else. You must, must, must be up to par with your water changes, water top ups, vacuming the tank if you use crushed coral. It can be done, but do alot of reading before attempting this.
I just love my nano and have thought about going bigger but I also have a 25 gal freshwater and a koi pond to I have to take care of. For some good sites about marine fish email me and I will give you some great sites.
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good luck....bugsy B)