Need Advice ASAP!! Fin Nipping!!

just an update, i took the serpaes back a little while ago, and have been watching the activity in the tank for the past 30 minutes. Everyone seems much more relaxed, and less afraid to swin to where the serpaes had claimed as their territory. I do beleve that the serpaes were the culprits. Thanks everyone for your advice.
 
red minor tetras have been known as a community fish but with the nasty habit of fin nipping smaller fish..
 
yea, unfortunatly, I just found that out the hard way :D
 
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