I am guessing female looks alot like my lady gt the fin style the shape and slope of the head all very lady like u should watch the gt closely it should be sexualy mature and if it's a lady it will lay eggs sooner or later the fish may become very aggresive to tank mates when this occurs here is a pic of my lady gt and 1 of the pair if u would like to compare if u look closly u can see the male silver saum has a wider more bull headed shape not quite a hump yet but we are working on that haha..