Wanted to amplify @Lost in the Sauce's suggestion to go for a pair of crosshatch triggers. They are gorgeous and would also make excellent use of the space. Might even become your favorite fish.
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Genicanthus angels are much less likely to go after coral compared to the other angels.I am a little afraid to put triggers into my reef: there are loads of corals in it.
Not sure if its a good idea. Some of the most stunning fish i've ever seen are angel fish. but for the very same reason i am staying away from them