P.S. I get my africans from a species tank and look for the most dominant fish in the tank, which will usually yield a male (this is not a 100%, but if the fish are anywhere around 2" the odds are in favor of it being a male) it's how I've got my acei, yellow lab, red zebra, afra and greshakei, which after venting are all males. Alot of lfs's will also let you vent fish (again if they're sexually mature) or will vent them for you, if they don't feel comfortable with you handling their fish.