That came from an old misunderstanding about what they were. For a while, saddle clowns were sold as "black and white" clowns, usually erroneously by wholesalers. Most people have caught on, fixed the issue, and got actual A. ocellaris in stock, instead of A. polymnus. Not all retailers have fixed the aggression part, though. They are exactly the same in temperament when compared to regular A. ocellaris.