Yeah nanos are small tanks, usually cubes below 30G. Red Sea I believe sells kits that you can start with. Depending on inhabitants some upgrade these kits with stronger pump for increased water flow.
As steve has mentioned they are harder to maintain becuase of the small amount of water. Any negative change in water chemistry can be disastrous. Many advanced hobbyists have been keeping these "desktop" tanks very sucessfully though but I would not recommend such small setup to a beginner.
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