you are right. swordtails do need to be in a 1m/3fm ratio, or they will become a bit agressive and nippy. they females distract them and keep them away from the other fish's fins. i have found that the same thing goes for mollies.gstoffer said:As stated already I would suggest getting at least 6 neons. The swordtails need I believe 1m/3fm or aggression may become a problem. I could be wrong on this but this is what I have been told and why I only have 1 (male).
Good luck!!