Join Date: Jun 2009
Location: Honolulu, Hawai'i
One thing, just keep an eye on the temp, because small bowls can heat up quickly, and you don't wanna go too far in the opposite direction and cook him :)
One other thing, temperature fluctuations are more harmful to bettas than lower temps. So, for example, you don't want to get him all warm under the lamp in the day and then have his bowl temp drop quickly overnight. You'd rather have a steady temp, even if it's a little on the low side.
Just keep an eye on it, and don't try to raise his temp by more than, say 2 or 3 degrees in the day, and he should be ok until you get him the real tank with a real heater.
55 gal - 1 betta, snails, some shrimp, various plants
20 gal - 1 betta, snails, shrimp, java moss and fern