I have six Yoyos (3"-5") who live with a horde of Cories -- Albino, Green, Bronze, Panda, Skunk, Matae, Schwarzi, three-lined and a bunch of strays (I don't know what they are), and they get along fine. I also have them with Clowns, Dario, a Tiger (would have more than one but I keep losing them), Zebras, . . . and they all do fine. I've had some of these fish together 2+ years without a single issue. Everyone sort of ignores Cories in my clan.