I have the same size tank. For a tang, I realy like my Tomini Kole Tang, he is realy mellow, just cruises the tank munchin the green stuff. I love my Leopard wrasse "common?", I had the "South African?" Leopard wrasse, beautifull blue and red, but he just dissapeared after a month. I had a pygmy dwarf angle for a year and never had a problem with him and corals, ablolutely beautiful. RIP carpet surfer. I also have a pair of black clowns, one false perc, a one eyed yellow tang, royal grahma, and a lawn mower blenny. Just some of my favs.
Gabe