Did you use water straight out of the tap?? Tap water's chemicals can be very harmful to fish, you should always condition the water before you put your fish in it. If you can let the water sit over night it also helps. Temperature could also be a problem, bettas do best in water that's between 77 & 80 degrees F. If you frequently clean the bowl then I doubt Ph & ammomnia are a problem, but you should check that anway.
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