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I didn't choose them! I would've had a pair of blues, but my Mom's red betta was getting bored so i bought the best female- red cambodian- to look at, and now they're interested.
It is hard to tell what color you will get, red is dominate but some of the recessive colors can show up when you breed two fish. If you are using bettas you don't know the genetics on you could end up with nearly anything but most will be red.
If they're from a pet store you can get the weirdest most unexpected offspring. you could end up with doubletails with blue patches it's really hard to say.