I believe I can sex the albino zebras They are about 2+ inches.
The star sapphires are sexable, except for the latest spawns. 3 inches and down.
Adult Yellow labs are males ( no adult females for sale) Juvies sex would be just a guess. Juvies are about 3/4ths of an inch.
Albino kribs are young adults and sold in pairs. They are around 2 inch. females are smaller.