I have a similar issue in my tank. I have a royal gamma, occy clown, and a blue damsel, and a neon goby. The one getting bullied is my damsel from the clown and gamma. I'm upgrading my tank and not really doing anything about it TBH since the damsel was picking on my goby. Once the 55 is up and running, I'll be introducing peaceful fish and then the stock from my 36 so the territories won't be an issue.