Depends on age if they are young they will be fine if they are older then I would recommend not. You can put 4 clowns as juvis together and they will more than likely be fine forever as 4 will make a pecking order. Female, male, then the other two will stay juvis. I have a 100 clowns together but they are all 4-6 months old. I would not do so with adult clowns. JMO