i feed my 33inch aligator gars small local cichlid fish , known as chira over here in pakistan. i also feed them dola, a local snakehead species. i buy them in bulk from local fishermen, so it costs me very very cheap, its 100% organic, natural prey, natural food. my gars are now 11 years old and i feed em once a week.
get yourself feeder fish, if not, go to a local grocery store's meet section, but fish from there,ONLY fish and shripms. buy 2 or 3 kgs, make small bags, put em in ur freezer, defrost fully before serving