Yup my Rubripinnis was a complete jerk! Even chased my blue eye kole, which obviously was much larger.You didn’t hear this from me butt… If you play your cards right you can get it to work. If you want to know how then I can tell you what I did in my 4’ tank to get a gang that shouldn’t have ever worked out.
But as @i cant think every fish's personality is different, and sometimes it can work out just fine. Take for instance a melanarus, yellow corris, and red corris all living together quite well in an 80G cube.
An acclimation box, and mirror are you friend sometimes.