Good thread, despite the bickering
I don't know anything yet about how tough the maintenance is for any size tank, as I'm still in fishless stages of mine.. but my knowledge of chemistry makes me agree that a lower volume of water is easier to foul up quicker. I would imagine that even a mini-cycle due to introducing new fish would be more pronounced, and thus could be more trouble for people who don't quite understand the cycle idea, or who have fish that are not particularly hardy (which may be the case during the learning curve). Of course I guess this could work in the favour of someone learning the hobby -- the more dramatic the changes, the more quickly one is forced to learn!
But I happen to believe that learning the hard way is sometimes more discouraging than it's worth, and so I understand why 10G tanks are not recommended for total newbies.
On the other hand, I am personally setting up a 29G right now, and it "feels" like a big job
psychologically, and I would imagine some newbs would feel uneasy taking on something that "feels" even this big. Of course if a job doesn't "feel" big enough, it might get neglected -- perhaps that's what happened to my betta bowl as a kid, and what's happening with that lady and her three goldfish crammed in the 2 gallon tank.
To strike a good balance between chemistry (which says "go big for stability!") and psychology (which says "you can only handle what you
think you can handle!") I would recommend that a nervous-newbie should probably start with 20G or 29G .. depending on space available, money, etc.
If I knew someone who is considering getting into the hobby via a 10G, I would suggest that they
consider starting larger, and give them the two big reasons: (1) more forgiving to any changes, and (2) more flexibility with the number and type of fish. #1 makes bigger sound more manageable, and #2 makes bigger sound more fun.
On the other hand, if I knew someone who was considering getting into the hobby via a 55G or larger (say, after reading that "bigger is better"), I would be forced to ask them if they were prepared for all the tasks involved. Does this person realize that aquariums require weekly water changes? scrubbing of algae off the walls? gravel vacuuming? filtration? aeration? The job does get bigger for bigger tanks, and I wouldn't want to watch a big investment go to waste because it turns into a chore rather than a relaxing pastime.
Of course, adequate research can prepare anyone for anything, big tank or small tank, but I would recommend a medium-small tank to anyone interested in getting into the hobby. If the newbie in question provides good enough reason(s) to divert from the recommendation, then at least I will have said my two cents, and of course it's their choice what they do with their time and money. If all else fails, I am willing to buy their too-small or too-large tank off of them if they decide to give up!