Yes he will eventually want a bigger tank, then the mts sets in. Lol, there is no right or wrong answer to the question posed. Some people prefer nano, or even pico tanks, but it all depends on what you want to keep. That being said, your 45 is perfect for a first tank, you could build it for an economical figure and keep some fish, then determine if its a hobby you really enjoy and move up or down accordingly. Remember, the smaller you go, the more difficult the system is, because it is easy to cause large swings in your parameters. Always research livestock before you buy it, to make sure it is suitable for your system.Welcome to the hobby!
It's been real AA.