He could do a small softie tank and get by with like a 96W 24 inch PC light with maybe 1-2 small fish (a clown, a small goby, etc). This wouldn't be too $$ to set up. Get about 15 pounds of LR or so, 2-3 inch sand bed, heater, lights. A small HOB filter would be fine, as long as it is cleaned properly, and water changes are done weekly to bi-weekly.
Tanks are great for kids IMO, if they are willing to take care of them.