OMG ok so i moved thes 2 septa tetras out of my 10 cause they were niping my corys fins and some have acctuall damage , soooooooooo i move them to my 5 with my guppies (peacefull haha) my tiniest guppy or it could be an endler its so small has been following them around for like 30 minutes nipping thier top fins . ithere doesnt seem to be any damage but i think its funny thier pennence happnes to be thier crime. and the insult is its the tiniest fih in the tank thats bullying them. funny thing is . when i had my cories in with him he never even thought about nipping fins and he leaves my bigger guppies alone.