Hi gang, One thing I have had work a couple of times with mean males is to keep the pair together in a 10 gal separated by a tank divider. Leave them like that for a month or two - they sometimes get used to one another and once the divider is removed, they get along. This worked well for one pair of panduro I had. I think if you have the option, Kaycy's advice is good ("good lookin' guys are a dime a dozen....."), but if you don't, give the divider a try. Lisa