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By its general size and appearance. Most Tetras are not long lived fish and depending upon species, live for 3 to 5 years. I would advise buyers to always buy from a reputable breeder if possible. If you can't find a good breeder then use a reputable pet store and after researching the species, buy fish from healthy looking, active schools of tetras that are not quite full size.

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14y ago
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14y ago

It's only by experience that one can judge the age of most fish including Neon Tetras.

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12y ago

well u can tell by if its a female and if its kinda chubby

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Q: How do you tell the age of a Neon fish?
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