Check further into the Genicanthus family. I think most of them grow quite large. Considering the two tangs you have already that will grow to be big fish, another large one may not be a good choice.
Dwarf angels can be beautiful, but are not always reef safe. I've got a flame back dwarf in a softie tank that only hits on the occasional snail but leaves the star polyp, mushrooms and xenia alone.
Royal grammas are beautiful fish and would be the safest choice, imo.
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