Frozen food, I feed it every three days. I used to feed mine cichlid stick loaded smelt, but I've been trying different frozen fish. i.e. yellowstripe scad, yellow croaker, gourami and etc. I found that sardines broke apart too easily. My army would grab it and it would split in half. During fishing season, I just drop sunnies in the tank to self feed. Depending on size of sunnies is how long it will go without feeding.