A little backstory here, I have a 55 gallon setup with my 4" Electric Blue Jack Dempsey, 4" Firemouth and 5" Senegal Bichir. It was working great however the Firemouth has been acting very aggressive towards the JD. I've tried numerous methods to calm the aggression however it's gotten to the point where tomorrow I am taking him to my LFS to trade in. These three fish were my final stocking for the tank, but since the FM is going I'm looking to add a different fish. Something that won't beat up my Jack considering he's the centerpiece (as well as the Jack beating up on it) and won't fit into the Bichir's mouth once he's an adult. Any ideas?