The croc gar pays no attention to small fish. I owned him for over a year and knew his prior owner for 2 years before that. He's never eaten a tankmate or been fed anything live. I fed him a lot of shrimp and fish filet, but he survived and thrived off of a bag of large hikari pellets a day. I had him with an 6-8" azul for 4 months or so. That would have been a $500 snack. I had no worries.