We have two albino and one peppered cory in our ten-gallon. There has never been a hint of trouble. You might want to reconsider the cherry shrimp. Our betta chased the ones we had. We never saw him kill any. But we no longer have any cherry shrimp. Could be a coincidence. He doesn't bother the ghost shrimp though. He doesn't even seem to notice the apple snails. So there's another option to consider.