I don't have a lot of experience with my pair (Cheech & Chong), but I have noticed that they will eat pretty much anything. They love their live blackworms, frozen bloodworms, frozen brine & mysis shrimp, and pond snails, they also eat flake food, bottom feeder pellets and Algae waffers on a regular basis (presently housed with some Ottos and guppies). They haven't shown aggression towards their tankmates, but will rush in and shoulder block the other fish away from the food, they love to steal the pellets and waffers away from the Ottos.
From what I've been able to find out, they do eat seed pods in the wild so may need some veggie matter in their diets.