I have a 12 gallon nano dx now. I am working on finishing my basement. And as strange as it sounds to some, even to me..

. My wife to be has asked me if I have thought about putting a tank in the wall. My step-dad is a carpenter, or is that jack of all trades master of none. Anyway, how much of a difficulty difference is there between my 12 gallon nano, and say a 50-100 gallon tank??? My 12 is saltwater, with 2 clowns, leather, fungia plates and zos. Any suggestions-encouragement is greatly appreciatted>>>>> I've had my 12gal about 14 months!!!!