With any recessive gene (albino(all strains), axanthic, pied, clown, ect) both animals have to cary the gene for that mutation. A het to het pairing gives you a 25% chance on each egg being visual for that mutation, visual to het each egg has a 50% chance, visual to visual every egg will be visual. I beleive there is a very good sticky post @ the top of the page that explains all of this. Perhaps people should be reading this and trying understand the genetics abit so they can ansewer some of these questions