Ocean in a box can order live saltwater ghost shrimp at I think $20 for 2k of them. If you set up a smaller tank to house those and drop them in your tank by the handful the fish would have plenty to eat and the shrimp in the smaller tank will breed replenishing there numbers for a self sustaining food supply. Thats what I am going to do for our puffer and lion fish. Seems pretty cheap to me I will post on how well this works after I get mine.