I was thinking about picking up one of these too. For those of you who have these, how do you keep them warm? Are there any reliable heaters for something this small? I like to crank the AC and keep the rooms at about 70-72.
And dividing a 2.5 might be ok (minimum recommended for a betta is 1 gal), but I think the fish would be happier with the whole tank (with the inch per gallon rule).