newbie here

29 is the minimum size I'd recommend for a first tank. The bigger the tank, the easier it is to maintain high quality water parameters.
 
I have the best of both worlds -- 300 gallons (including fuge/sump) on one side of my living room, and a 12 gallon nano on the other side of the room.
 
A nano with a big hidden sump is technically still a nano, therefore it is not cheating. Gives you the cheapness and "coolness" of a nano, but the safety that comes with a large water volume.
 
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