Curved caudal peduncle

[alysonpeaches]

I recently obtained some "gold laser" cory from another fishkeeper. On adding them to my quarantine tank I noticed that one of them has quite a pronounced curve on the caudal peduncle, it goes down then up when viewed from the side bit like this ~ . Another has a slight curve but the rest are relatively straight and like my bronze corys in my other tank.

This is worrying me. Initially, I thought, oh no, fish TB. But when I read about fish TB I understand that there would be other signs evident before the curving spine. This fish is active, feeds well and doesnt seem to be ill in any way. Is it just a congenital deformity? Should I do anything about it?