In my 28G, I'm keeping an African Flameback, Banggai Cardinal, Six-Line Wrasse, Blue-Dashed Blenny and Wheeler's Shrimp-Goby. Most sane reefers would recommend against keeping the Flameback and Six-Line in such a small tank, but I think it's possible to make it work with some luck and effort.
I've had the Flameback for over a year in that tank and it's never nipped on coral. It had, however, killed a Midas and Canary Blenny after several weeks of no issue. It tried to kill a Tanaka Possum Wrasse, but I was able to rescue it before it was too late. It gets along great with the "tougher" fish, like what I keep it with now (so far).
Honestly, you're better off without the Flameback, but if you insist, I recommend adding it last and only with "tough" tankmates. You'd have to be very careful with what Blenny/Jawfish you keep it with. I consider the Flameback the centerpiece of the tank, but it has limited my choices for other fish in there.
If you drop the Flameback, you have more options available. Maybe some Firefish, a Possum or Pink-Streaked Wrasse, Royal Gramma or some Basslet. I agree with Mike about keeping only a mated pair or single Banggai.