There's no reason you can't keep one by itself, but there are interesting interactions in colonies (one male per group).
I have a trio that has been in a 30-something gallon natural set up for a few years. One of the females and the male follow each other around constantly, and call to each other a lot. I've heard something that sounds like a pleasant bird call coming from their tank, but I haven't been able to record it yet.
Anyway, make sure the animals are old enough and sexable before putting them together.
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