+1
shiner minnow are their nature food, and they can be found at almost any live bait shop.
I found out that keeping smaller shiner minnow alive is a lot easier than the larger minnows that I bought. Most of the lager minnow(some shops listed at bass minnow for the lager size and the smaller size is crappie minnow) that I bought die within a few day while the smaller minnow live and even breed in my tank.