Thanks everyone. I'm so used to how big he is, I never really think about it anymore.
I feed him pellets, anything frozen (bloodworms, brine shrimp, mysis shrimp, beefheart), live blackworms (very occasionally), and flake food.
Doesn't really eat anything larger than that, because although they have a large mouth, they have a tiny throat, and can't really swallow anything larger than a few millimeters in size.