i would upgrade to a real aquarium - and ditch the bowl. all fish need filtration, no matter what an LFS or big box pet store says. heater is also a must, unless you keep the little guy in a fairly warm room (with a consistent temp).
Also, one gallon is mighty small space. i would go with a bare minimum of a 3 gallon tank. I have an eclipse 3 gallon, its small- but still has enough space for him to swim around, and it provides filtration without a strong current of water flow.
with a really small tank be extra careful about over-feeding, and you need to do regular water changes more often (i do 50% twice a week).