Thank you Rose for this information

Maybe I didn't understand properly what you just said, but I meant: How do Bettas survive in nature, in the wild, on their own? I've read that smaller fish increase their chances of survival if they live in groups (they are not eaten by larger fish because when they're in group they look - from further away - as if they were one large fish; therefore the predator will leave them alone thinking it's one big fish). And since Bettas cannot live even in pairs, as they'll fight to death, how do they manage to survive in the wild? Sorry if I misunderstood your post, and sorry to bother you with so many questions!