Take note that some of these fish require a large tank, or a predator setup and some are NOT reef friendly. Nearly all of these are fairly hardy and can be kept by beginners IF THE SETUP ALLOWS IT
Clownfish
Chromis
Royal grammar
Dotty backs
Pigmy angels like Coral beauty, bi-colour, flame, etc
Tangs, eg yellow, scopas, purple, regal, orange shoulder tang, etc
Algae blennies
Bangai & pajama Cardinals
Auriga butterfly
bi-colour blenny
Carpenters flasher wrasse
Red head salon fairy wrasse
Clown goby
Fire fish
Some triggers like Picasso and Niger
Midas blenny
Foxface
Raccoon butterfly
Sand sifting gobies - easy to keep if they eat pellets or frozen foods