is it possible to tell the sex of a baby dempsey like 1-2 inches

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It is possible, to a degree, although at a small size it is possible to make a mistake without experience (or, even with!).

Typically, if the fish are from the same spawn, get the largest, most colorful individual. At that size, a fish exibiting dominance over the others is most likely a male.
 
Possible but some what of a hit or miss if u have a spare tank or somthing of that nature keep a little group together and see who become the aggresser
 
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