You need either a single female or three+ females for bettas. Get one and they'll nip on your other fish' fins, three will spread the aggression out among the other females so as to not make them stressed.
As for less aggressive... yes, but only slightly so, in my opinion. They can be pretty crazy!
I love them, though. I have a few in one of my tanks and they add great color. Female crowntails. Beautiful :3
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