I find them to be less maintenance than a larger tank. The main reason is because there's so much less water to deal with. Well, I see you are thinking about a 29g. My nano is only 6g, so I can do a 50% water change in 5 minutes. (I only do about 10-15%, but if I had to do a massive WC, it would be easy.) 29g might end up being almost the same amount of maintenance as a larger tank.