My make umbi is about the same size as the salvini in the 125 and they hate each other, they lip lock alot but thats about it, my male festae is alot bigger and is always there to break it up, they are calming down now, that usually happens at first when I put in new fish, alot of sizing up but after they tend to ignore each other. I cant put any larger fish in because they will get killed. Only smaller ones for now.