A2 - since youre going with a reef, clowns would be GREAT. I also love the sixline wrasse, and firefish r a nice alternative to clowns if you're looking for something just as active.
You could also go with a couple clown gobies, as they are teeeeeny tiny and can be housed in small groups. These fish are ADORABLE and have great personalities, suprisingly.
Not all these fish at once, of course, but contrary to popular opinion there are some really great options for smaller tanks!
let us know what you go with! :joy: