Hi, this is a similar question to the one already asked. I tried 4 fish, but the dominant fish bullied the others, even to the point of causing them to die, and also did everything it could to prevent them from feeding, therefore growing at a disproportionate rate and making it even worse (Is there such a thing as an evil fish !) What number of fish would you suggest to cause the problem to disappear ?
Transfer the dominant fish that bullies others to another tank. I don’t know how big your tank is. If it is a big one you can introduce more fish. So the bully will get tired of fighting so many other fish.