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You can't exactly tell unless you are a professional but if you want to know roughly then look at their scales to see if they are a bright orange or a dull orange

if they are bright the fish might be still under 1 or maybe around 2 but . . .

if they are dull your fish maybe 5or 6 which means the life isn't going to last much

longer.

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15y ago

What else can I help you with?