@eatbreakfast is the person you want to ask.
HI! Well I'm honestly open to anything predatory. I really really really want a lion, but I'm honestly I'm just worried about my miniata. He was a gift...that turned sour. In my friend's tank he was getting picked on, in mine he took out my Indigo Hamlet immediately. So whatever I get has to be able to handle that guy. He doesn't mess with the foxface unless it gets near his cave, but he absolutely hated the Hamlet.
Anything that wants to use caves and overhangs will be viewed as competition, and anything that is the size of it's own body or smaller will be viewed as food.
Monodactylus sebae or M. argentus. They are normally found in brackish water, but do fine in full reef parameters. They are hardy, very active, and will school.
They are very peaceful, but hardy enough, and fast enough to coexist with a miniatus.
Each tank is different as far as the bioload it can handle, factor in maintenance routine and how well different equipment functions, there really is no good answer. I would say to test your parameters frequently, avoid quick changes, and if they are fine and aggression is minimal, more fish can be added.
