He’s a handsome fish no doubt, and he fulfills the ‘not as common’ requirement. I’m liking the idea that a firefish or 2 might fit alright with him. They’d be the purple firefish, as a pair, and established before he was added. My dart fish pair in the 150 like burrowing at sand level, I’d expect the firefish to behave similarly. Is the wasp a rock or sand percher?Oooh, this is my type of thread :D
Here are a few I haven't seen mentioned yet.
Pygmy Rooster Waspfish - I got one of these guys and he's great. He's related to lionfish, so he's got venomous dorsal spines, but other than that he only grows to about 3 inches and is super chill with other small fish tankmates. I have kept mine with a Royal Gramma, Firefish, Yellow Clown Goby, Springerii Damsel, Possum Wrasse, and Pink Streaked Wrasse at one time or other without any issues.
Speaking of wrasses, both of those wrasse listed stay small enough they'd do well in a tank that size as long as they've got enough rockwork. You can check out my build thread, but I currently have both my possum wrasse and pink streaked together in a 25gal peninsula along with my Waspfish, a Firefish, and a Royal Gramma.
EDIT:
Waspfish tax :P
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Think any other fish could go in there with these hypothetical 3? Do you know if the wasp fish are sex-changers or if they can be sexed like mandarins? Would a pixie hawk be too much? Is the pink streak a sand or rock sleeper? Thought a clown goby would be too small and get eaten.

