I'm of the opinion that the middle range is best (20-60 gallons). Too small and they become tricky due to evap, fluctuations, etc. Above 60 gallons I think they become too complicated and expensive for most beginners. But then again, any well set up system can be easy to manage.
What I think it comes down to, ultimately, is this: In this hobby you get out what you put in. I would rather see someone with a system that they feel they can manage in terms of effort, money and interest than follow some "rule of thumb". A smaller system is easier financially and a person is more likely/able to spend the money to fix a problem. If all the livestock you are interested in needs a 90 gallon, get the 90 because your interest may soon wane and the tank falls into disrepair. In terms of time, small to mid-sized tanks are best until you learn the tricks of what makes a hands-off system. Some people are quick studies in the hobby and could manage any system in a short time and there are some that just don't quite "get it" despite being in the hobby for years.
I think for every person there is a "right" first tank. I think we should either have a questionnaire or some other way of figuring out what tank that is.
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