As said, what would you like to keep? Are you thinking fish only or a reef tank? I kept a 10 gallon reef for a year and it honestly wasn't too terribly hard. Biggest things with small tanks are topoff and water changes. As long as you top off your tank daily (or set up an auto topoff system) and do weekly waterchanges of 10 - 20%, everything else with a nano reef pretty much cares for itself. Welcome to TRT and ask all the questions you need.