ive had O&W percs with maroons, they where fine together, i will have to say that the ones already in your tank will harass the new comers for a few days after that they should be fine, if you see them both fighting together then in my experience pull the less dominate out and put him back in the QT and replace at a later time when hes healed, any time you are mixing any clowns you are putting them in danger, but it can be done with time and patients, just becuase they will fight dosent mean you shouldnt put them together, clowns will always fight at first as they have to establish the hierarchy, its not that they mean to be mean its that they are wiered to have a direct line of whos boss kinda like the military hahaha, my 2 big maroons will work as a team, its kinda funny, if i put a rock somewhere and my female dosent like it, she will go find her mate and its odd but i think shes telling him she needs his help becuase after she gose finds him they both come back fairly fast and shell start pushing at the rock and hell ram it hard to move it these 2 have moved rock that are a few pounds, and im sure if they cant move it they would find a way like digging the sand out away from the base of the rock and then tring again, they are smart fish, and belive it or not when i put the female in with my male she put him on a resparator, he didnt have any fins left, 1 of his gills where torn, and his mouth was dislocated, he looks normal now after 4 months of recovry and they are a breeding pair now, so just becuase they fight at frist dosent mean they will never get along
now people are going to flame me again hahaha, im saing this with experiance, but people dont like that i would purpusly put fish in harms way for the sake of haveing them together, i understand their feelings, and they in many ways are right, but with clowns i do not let anyone tell me im wrong by mixing them, i might not arguee with them but they will not change my mind on the subject of mixing clowns or putting 2 together, ive experimented and i belive it is the way i have said it in many posts soooo let the flameing BEGAIN hah