Define "nano"? Like 5, 10, or 20g. This can dramatically change the floor and height availability, an thus which plants that can be house. I use this site a lot, liveaquaria.com, and whatever else Google pulls up for a particular plant.
I have a cluster of moneywort stems in my 5g hex, for instance. It's really no different than larger tanks. You just have to find the plants that fit. Lighting it way, way easier to achieve in smaller, shorter tanks, but a 10w 6700k CFL is more than sufficient for moneywort.
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