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Originally Posted by Wodentoad  JD, I must respectfully disagree. Bettas CAN go 1-2 weeks without food, but feeding them every day results in a healthier fish with brighter colors.
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If you feed them high quality foods like New Life Spectrum they really really don't. I have 4 and 5 year old Betas (which is way way surpassing their expected life span) that I've raised on once a week feedings of new life with a water change the next day and once a month on blood worms. I raise ciclids and follow the same feeding pattern.
Fish in the wild can go months with out eatting, in our homes once a week is more then sufficent (again if you're feeding high quality food anything else is a lot of filler and nothing). Much more then that particularly in small tanks only leads to more pollutants in the tank which in the long term is far more detrimental to their heath.
Link removed - contains breeding information, you may PM poster for link if you wish ... is a forum full of a wealth of experienced fish keepers basically the aquarist equivelant of here.
If you can get a picture of your Betta's tail and post it over there I'm certain some one should be able to give you a suggestion for how to treat it but I still stand by my suggestion, water change and some Melafix to start.