Neon Dottybacks....
I loved mine, but there are a few cons to this fish also...
1) They are mean as hell!!!!! I saw one get bit by a snake once and after 3 days of excruciating pain...the snake died!
2) They are mean!
3) Did I mention they are mean?
Seriously, they are mean and should probably be one of the last fish added to the aquarium. Anything added to the tank after them will be hazed worse than any fraternaty pledge, and if it has a body shape or color even close...it's toast. These fish are micro predators, the exploring will never stop, because it's not exploring, it's hunting. If you have a mandarin, do not get one of these fish, they will eat the mandarins food source and still eat the food you put in the tank. Mine was always fat, it looked like it had swallowed a baseball, after food additions, these fish can really pack it away. Other than those things, they are one of the coolest, most active fish you could ever have. Even with the stuff said about them, I love that fish, one of my all time favorite.