Not to condone dyeing, because I don't, but I've seen some "fruit tetras" live quite a long time. Skirt Tetras are extremely hardy fish, to the point where I had one live in terrible conditions (my early days of fishkeeping) and he still was alive and kicking five years later.
I've seen full-grown "fruit tetras" at shops.
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current setup:
5.5 gallon low-light planted tank
-nothing....thinking a mini-community.
for reference: my name is Julie 
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