I've heard the same thing about Colombian tetras- they develop some sort of skin/scale disorder as they get older (makes me suspect some sort of nutrient deficiency??)
Odd that the Florida Flagfish seems to be suffering the same issue, though... makes more sense to me to suspect an external parasite over an internal, if the fish are eating and otherwise behaving normally...
Have you tried salt treatment for a week? 1/2 tsp per gallon is what I use with sensitive fish like tetras. This might help with an external infection of some sort. And/or Melafix and Pimafix might be good choices.
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