I'd give him a few more days and if he's still not eating then start to worry. The personality that we love about these larger cichlids can be annoying at times. I had a oscar in my 180g that annoyed the crap out of me, being a typical oscar. He would get pushed around by my male jag that was the same size, not bitten just chased and flared at. Then as if to appease it's bruised ego, it would proceed to chase and nip at my smaller female jag. He started ripping up my live plants and was a total pig at feeding time, Eating everything it could just to keep the other fish from getting it. After a bit of a struggle I managed to catch him and relocate him to the 40 gal breeder I'd set up to use as a quarantine tank for the feeders I was giving my peacock bass.
For an entire week after I moved him any time I'd walk in the room he'd stop what he was doing and either swim into the small flower pot/cave and leave his back to me or swim to the bottom and flop over on his side and just lay there. He didn't eat for 4 days and wouldn't eat if i was in the room for almost 2 weeks, even if I dropped a feeder minnow or red wiggler both of which he loved.
My point is your fish is probably just pouting and he'll get over it.
