I must most respectfully disagree when it comes to tetras. There have been too many instances of neon tetras and some of the more common ones here nipping on betta fins and causing infections that are horrid to try to clear up. The fish themselves ARE peaceful but not harmless to bettas. This is a behavior that while not necessarily totally hostile is not acceptable to betta owners due to the problem it causes with the bettas health.

They are fine fish but not good tankmates for this type of fish as they are not seen as threats and the bettas many times allow them to simply nip away to the destruction of the fins.

Rose