I have a approx. 12 inch Jack in a tank by his self. I feed him Hikari Chiclid Gold. I have several other tanks with a variety of fish. I like to get them crickets, worms, grass hoppers, ect, for treats every now and then. I also have a couple of different foods for each group. All except Jack. With crickets, worms or anything else for that matter he will watch it pass right by, but will go nuts for the Hikari balls, he will take them right out of you fingers. I can't really complain, Hikari is probably good for him and is a good stable diet but I would think it would want something different every now and then. I am not a feeder fish fan, besides you have to starve him for days to get him to eat a feeder. Any suggestions or bizarre foods they like?