In the grand scheme of things all our tanks are nano's compared to a real reef. IMHO you can keep a 20 and call it a nano, your the boss of your tank no one else. I've got a 20 standard nano and its a nice tank, no complaints, I plan on a 1 gallon nano in the near future (some call em micro's). Good luck with the 20 its got alot of potential.
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