What size nano? I hate bare bottom as much as the next guy but in smaller tanks if you plan on keeping them more then a year this is the way to go. In 2 my gallon I originally had a thin layer of aragonite but it just trapped more and more and more detritus. I took it out and almost 4 years later the tank is still running great.
If you're talking a 15-20 gallon then medium sized aragonite is fine. Just think about if you're going to be able to vacuum it or not. It will probably be okay for a while but after a year or 2 it will be pretty gross if left untouched.
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