I vote midas blenny.
Mine is very social and active, always swimming around the front glass of the tank. he gets along with my lawnmower and all my other fish too. And of course he's awesome looking! With his blue eyes and yellow body he stands out quite well.
180g Reef - 60g Rimless Reef -90G FOWLR- 125g Malawi Cichlids- 40b REEF- 34g Fresh Planted-working on- 20L FOWLR- working on
I have a mix of many different saltwater fish amongst my tanks, but I love my Tangs most of all.