i did post about this being extremely hyperactive also, but had no luck in purchasings stones to create caves for it today, that will be looked into in the next week so if anyone can tell me if this is a sign of distress in the plec, let me know that also
I had an albino cory that had a tail like that. She lived a good couple of years and spawned a few times so provided you give it a good home, it could live a long life.