clowns of different species generally fight, they can be kept together fairly well while they are young but once they start to get older they generally start to fight agaisnt the opposite species. i dont know how the black and white Ocellarus or percs would fair with standard percs though i personally wouldent take the chances. I my self have a pair of black ocellarus, which BTW up here go for up to 190 a pair, not something you'd like to fight and get damaged with ofter clowns.