When I got him, the lady suggested to me frozen krill so I got some of that. The 1st day he didnt touch it, and a different place suggested frozen mysis shrimp. That did the trick, just broke off a piece and tossed it in right in front of his face, and all the little shrimpie bits started to thaw and move around like they were alive and he took em. After that he ate pretty much anything I put in. I then got a bag of Cichlid Staple large floating pellets and he liked those too, and that was his diet.
I'd suggest trying mysis shrimp, maybe put em right near the outlet of your filter so they look like theyre moving on theyre own.