I'm wondering what kind of behavior is normal for neon tetras. Mine sometimes seem to get along, but other times one attacks another one. Is that normal? Are they just playing? I'm half wondering if my betta is being a bad influence.
That's not unusual behavior for any type of schooling fish when kept in smaller groups. One or two are always going to be the dominant ones and try to prove it constantly to the others. I have a group of roughly 50 in my 125g and it's a constant sea of red, white and blue.
Well, I found this old post on bullying neons and it seems to be normal. I posted a question earlier about mine doing that. I one especially that chases the others. He has staked out this one plant and he circles it. If they aren't in "schooling" mode, he is patrolling this plant. If the others come near it, he chases them away.