a 2 gallon is better than a bowl , so if that's the option that will help you save money ( to spend on fish food and medicine, gravel, plants w/e) instead of the 5 gallon, I'd recommend it. He would love the 5 gallon, but it's understandable XD
Does the 2 gallon come with:
- not needed, but lights
That's what you should have in order to set up a nice living condition.
Also, you are going to be doing a fish-in cycle so I'd recommend looking into these threads: