Most discussions around fish in a frag tank revolve around useful fish that serve a specific purpose such as algae control, pest control, etc. I’ve got three frag tanks and I’d like to flip the question a bit and I’m looking for ideas for fish that are just cool, different, fun. Maybe something you wouldn’t normally keep in the display tank because it’s aggressive to other fish or eats shrimp/inverts. Or maybe something smaller and interesting that would get overlooked or lost in a larger tank. The stipulations here are it has to be okay in a smaller tank (the largest of the three tanks is a 40g breeder), reef/coral safe (obviously), and needs to handle high flow.