i have had 6 or 7 albinos, and i don't remember how the earlier ones died (other than the one that got eaten by a gar). But I know the last three or four i had all died a mysterious death. Most of these i had for a good several years, and one of them got to 10", and the other ~8", the rest smaller. Anyway, one after another they would lose balance and couldn't stay upright and spiral when they tried to swim. This would happen out of the blue for every single one of them, and within a week or two, they would die.
anyway i really wasn't expecting this to happen to the 10"er. For the ones that were 'runts', i could chalk it up to weaker genes. But certainly not the case for the big one (or even the 8"er). On the other hand, the 10"er was kinda obese, and i wonder if that might have something to do with it, although the 8"er definitely had a healthy weight.
in short, i have no clue what happened, only that i'm now down to 0 albino.