Yellow, purple, kole, tomini, Chevron ($$$) tangs are all good choices. As far as Anthias lyretails are probably the easiest (relatively) but I like Bartlett’s a lot. Like hank said it’s really gonna depend on what you like. You could do a couple wrasses. A couple of flashers or fairy wrasses. Uh clowns, some sort of fox face if you like that. I know what I’d stock if I had a 120 but you could want entirely different fish lol.