I really enjoy all aspects of my 2 gallon. Is it hard, YES but its cool to have such a small tank. I think by taking some rock,sand and water from the 20 gallon you could have a good reef, maybe there is like a 13 watt PC you could have over it. HTH
I agree. To be really honest, whats the point of having a tank that small? You really cant stock it well with LR in it, and then you just run into a ridiculous amount of maintenance. Try sticking above 5 IMO. It can be done, but VERY challenging.