That sounds like a pretty awsome idea actually, have you tried it/heard and success stories with that method? And yes it seems like i picked the sissy bunch at the store lol! They had tanks with adults that would swim up to your hand when you put it near the tank. I just wanted the joy of seeing them raised from lil guys to big guys.
As far as a bigger tank goes, if I were to hit the lottery, the first thing i would do would be to buy about a dozen gigantic tanks! Money is a little tight right now, and I fell into my 90 gallon from pure luck. A well known keeper in my area overheard me talking about starting the hobby at my bar and explained that he had an inactive 90 gal that was in the way essentially and I got the tank, a stand, al the gravel, plants, a big rock, an air pump, under gravel filter (which i dont use lol) all for $300! Another tank that size or bigger would run me well over a grand....

j