I have a question in feeding my O. Right now I feed my tank Hikari Cichlid Gold......medium floating for the O and mini sinkers for the acara. I would like to add a treat for the O in the way of Krill, blood worms or beef heart. What does everyone use? I seen Krill in a container with the regular fish food or the frozen cubes along with beef heart and blood worms. Once again my O is about 4 to 5 inches right now.