I feed my Oscars and JD's craw fish with no problems. They are a big feast down here in the south when they are in season. I have a creek in my back forty that the kids will find them and bring them to the Oscars and Jacks to eat. I regularly feed my Oscars and JD's fresh shrimp from the meat market that I de-shell or sometimes I get lazy and buy the prepared frozen cocktail shrimp at the grocery store.