I've had problems with aggression between a pair of severums if they are both the same sex. Although I have had zero problems with my oscar even showing attention that my Sevs exist. probably because my oscar is 12"+ and the sevs are still just breaking 5"Cool. There is a very nice 4" red-spotted severum at my LFS. Just one, though. Along with the group of SDs and the juvie oscar, does it make sense to do one severum or two?