I've got a trio of azure damsels in my 65 gallon who only occasionally harass newcomers. (There was _one_ wrasse they took an instant dislike to...) I've also got a brace of Talbot's damsels and a trio of blackbar chromis in my QT, who have offered no annoyance to anyone.
Damsels, chosen with a bit of research, add a bit of bright confetti to the tank - and they're _really_ going to look like confetti in the 220!
Eramazetti, you've gotten some great advice above - many gobies, smaller blennies, assessors, even grammas could be a good fit - find fish you like to look at, and then devour every jot of information you can find about them!
~Bruce