Welcome to the site!
A damsel will outgrow a 14g tank, they grow to about 4 inches, they do bite drawing blood when mature, and they do kill any fish more timid than themselves. They are very aggressive. They are beautiful and do just fine for about two years..then they become the most evil fish God put on earth IMO, a very poor choice.
You said you have been into saltwater for a while, so maybe some dwarf seahorses...however, you must raise live food for them, you sound like the kind of person who could handle that.
Yellow clown gobies are super bright yellow, and they stay tiny.