I bought a Convict pair, Jack Dempsey, and a Firemouth. I added them all at the same time. The Convict killed the Firemouth and the Female Convict. I moved the Jack Dempsey before he could kill him. I tried many times moving the plants and caves around and he still would fight my Jack Dempsey. I tried a Peacock Bass. He killed it. I tried another Female Convict. They raised babies, then he killed it. What are some tank mates for a Convict?