If possible, my first suggestion would be to donate them to a LFS as someone else mentioned. The LFS can either raise them, or feed them to other fish all at once (I'm sure they'd have a lot of larger fish that would eat them quickly). Otherwise, I'd personally just leave them in the tank and periodically feed them to the betta. I don't like the idea of outright killing them, but that's just me- I'd rather let someone else deal with them through donation, or let nature take its course.
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