If I had a 6' FOWLR I'd add in a Candy Cane Wrasse (Hologymnosus doliatus). One of my LFS has had 2 juveniles for a while now and they're gorgeous and so tempting, but I don't need all my little fish and inverts eaten. Plus my tank isn't big enough for an adult. They're like a slightly more aggressive version of a red coris as adults.
A wrasse dominated 8' FOWLR would be gorgeous. 1 Paddlefin Wrasse, 1 Bird Wrasse, 1 Candy Cane Wrasse, 1 Anchorago Tuskfish, 1 jade wrasse, 1 coral hogfish, 1 cockerel wrasse, a few tangs (yellow, purple, desjardini, powder blue, hippo), an arc eye hawkfish, a trio of soldierfish, an asfur angel, a niger trigger, a picasso trigger, a pinktail trigger, and a few groups of damsels (juvenile Dascyllus and Chrysiptera) Super active, colorful, and should all do pretty well together.