Look for egg spots on the anal fin. That will give you a better chance of getting a male. If you were in Toronto, I could help you out with some juvie males: Auloncara Bi-Color 500, Otopharynx Z-Rocks Lithobates, Mbasi Creek Lethrinops, Auloncara Masoni, Placidochromis Jalo Reef, and Protomelas...