I've heard of them paired in aquariums on several occasions. Not that I'm suggesting that they're exclusively monogamous in the wild (adultery is common in many species besides humans), but when there's only one male and one female in a tank, they don't have much of a choice.
I think a pair of Genicanthus sp. angels would also be an excellent acquisition, and significantly less expensive.
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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