Do Male Harlequin Rasboras Flare Their Fins??

Zoso94

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I have a school of harlequin rasboras in my tank (3 normal and 5 black) and i noticed that 2 of the normals are always swimming tightly together and both flaring their dorsal fins for extended periods of time. I'm not noticing any aggression between the two or anything, I'm just looking for good ways to sex these guys as I have no idea. Thanks for any responses
 

yukondog

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Mine do, but no actual fighting, the females will be more full bodied and rounder than the males, all my males are smaller than the females, hope this helps.
 
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