Just not a good idea....putting bettas with other bettas. The only way to have more than one betta in a tank is to have a female only tank ...making sure there is plenty of room and hiding spots for them. Even then you have to keep an eye on them for a period of time...to see if there is an overly aggressive or overly passive female..those you would have to remove. You will still get some chewed up fins until they all settle who's who and where thier personal space is.
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