I had 5 bent spines in a litter of 13, from a female that was 3-4 months old. She dies and hour after havig them, I now only have 2 from the litter one with a very very bent spine and the over can't swim for long periords, there in the main tank to life out there days, I only once thought about having them PTS, but that was when there was 5 of them, and I knew I could'nt keep all 5.
there happy now lifing with there 2 antie and father, and the rest of the fish. when they die they die, least they had a little bit of life.