Hey Sandy, I have had bent females some of which I think have been grown up too quick and I have had a couple of fry that have developed as they have gotten older which is probably genetic, had a few from the Gold Ribbon Females. The ones that go like bananas and fade away, I think is weight of tail, mostly male, the tail gradually drags them down and they go like get bent like a banana. I have lost lots of weak linebred ones, the offspring were even weaker. I cull.... now.