Most manufacturers say don't buy more than 3 months out but I think a Aquamax rep at one of the conventions told me a few years ago their feed holds Vitamin C up to a year. Perhaps someone that has a contact with Aquamax can chime in?
Like I said earlier in the thread these spinal deformities, if they are feed related, vs. genetics or eletroshocking, take place in the formative period of a fry's life. Not later on. That said deficiencies in vitamins and minerals can cause other problems anytime in a fish's lifetime.
