Sexing My Albinos?

[FWFishLover]

well my little albino cories are finally coming up to size where you can sex them
so my questions to you guys as i know next to nothing of them [besides tank and other fish compatibility] is how do you know whether its male or female?

 

[Harlequins]

I think most Mature females grow longer (and wider) than the males.also the round belly of the female,she keeps her nose off the gravel when she rests.I'm not sure if this applies to all cories,but usually if you look from above you can see the female being wider