First tragedy

pappy Member Posts: 15
Well i woke up this morning and the first thing i saw was a fish getting pushed around in the filter with closer inspection it was one of my peguin tetras with its tail gone and it was dead all the rest of my fish are good and the water parameters are good. There is no other fish in the tank that would fin nip ( corys, mollies bnp). Will peguin tetras fin nip if few to are kept i had 6?