I think the seller means to explain that you will not produce visible clowns without another visible clown OR a snake that is "het for clown" meaning it has the recessive gene for clown but looks normal... So you will only get clowns with these possible pairings: ClownX Het Clown OR ClownX Clown Or on the less expensive side, make your own and try Het Clown X Het Clown. Hopefully I've explained this clearly... if not I know others will chime in