Considering that you just got him I would think he maybe a little timid in new surrounding. They are not the most aggressive but they generally can take care of themselves.
I had the same one that Bderick has now. I had several different combinations of fish in with him that he got along great with, including Silver Dollars, Uarus, Bichirs, Catfish, Rainbow Fish, etc... I found the ones he showed aggression towards were other aggressive Cichlids (no suprise there). So there's something for you to think about when you're looking for new tankmates for him.