She had two gills one dies of old age, so I gets her a replacement gill so the one remaining was not on its own. Both adults,It's been a weak and there still full on fighting one is living on the bottom tier and the other gill on the 3rd floor.tryed a few different things to get them to get along different terroritory etc.When in a bury they just avoid each other,I'm obviously know ferret expert so ideas welcome?