Some bettas don't flare. It's not like every single one is going to go from calm happy fish to raving mad rabid thing at the sight of his reflection. You might have a chill fish, which is pretty common. so long has he is healthy, moving, not lethargic, eating well, pooping well, in a heated tank (76-80* F), and ammonia isn't building up too quickly, and the tank filter (if it has one) isn't too strong, he should be fine. If you think he is sick, then you might want to look around the betta disease& emergency part of this forum for people who have sick fish similar in symptoms to your fish, and see what people have to say, or you could make your own thread.
The Fighter: I don't mean to offend, but I see you referring to your fish as fighters, do you just mean Siamese fighting fish, or that you actually fight them?
Last edited by JKfish; 09-26-2010 at 01:15 AM.