I have three boys, two are father and son(a bonded pair I adopted)Yoda & Oobie and the other, NIkko I slowly introduced a year ago and after I was sure they were all compatable I moved him in with the father and son.They have all shown 'affection' (touching noses) and have had no issues. Now, almost a year later I am noticing Nikko is becoming dominant and being aggressive with the other two. The father takes it in stride as he is a big boy like Nikko but Oobie is smaller and seems to be getting depressed. I have sat back and watched and Nikko is being nasty to him(will chase him off the wheel, will sit ontop of the house Oobie sleeps in). Oobie seems to cowar in the corner alot. He still runs around but not nearly as often as he used to.He looks like he may be losing weight. I currently have the father and son together but seperated from Nikko. I have a ferret nation cage so they still have plenty of room . Just reaching out for any thoughts on the situation or advise.