My hillstream loach is “defending“ my snail from the cories and yo-yo loaches, and it is so interesting in that it’s like they are now friends with each other. My Hillstream doesn’t like cories, so she chases them a bit, but they don’t get hurt, and she tries to back off the loaches from the snail. It’s an interesting behavior seen in them, but I think it’s also just a coincidence.