chromis great choice and although a damsel, the least aggressive, and does not resemble a damsel in temperment at all, even less so than the clownfish. In fact are more peaceful than most other fish. But do best in small groups.
clownfish are great too, depending on the species, some can be aggressive
firefish, great and hearty fish, does best if kept in schools of five or more, if not you should only get one, a pair is not advised, unless they are mates. Purple firefish on the other hand are just as good whether paired or single.
Other than that, I would probably say Bang gai cardinal or LMB. As to the use of cyanide, cant say for sure, but ours is nearing 3 yrs in age and our LFS will not buy anything where cyaninde is used. i do realize she can say what she wants, but believe me, I know her and she will not get it for you if there is even a remote chance that cyanide was used. UNLESS it comes from a breeder that breeds the fish. She s a major conservationist.
If asked to get certain fish, she will come right out and say" I will not get those fish, because of the way the capture them in some areas", adn will explain to you. In fact, it was her who told me of the use not a BB.