I have a lunar wrasse that is about 4-5 inches long. Amongst other fish I also have a spotted grouper that is about twice the wrasses size. Not necessarily length, but by mass. The grouper is considered very aggressive so that's why I put him in last. My other fish are just rated "aggressive". Anyways, today the lunar wrasse decided to pick the eyes out of the grouper, completely! The grouper is still alive but obviously not doing well. This is not necessarily a "what should I do" post but just something I thought I would share.