I have a blue liped trigger, a diamond back gobby, a damsel,a spiny-box puffer, and a large pistol shrimp in my tank. This is not the norm though. I hand feed all the fish except the pistol and damsel. And the octo gets 1 large crayfish every week. So I think the reason they all get along is because they are always well fed. But like I said, this is reare.