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Bob, what's the reasoning behind not keeping just one?
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That came out of a book, it states keeping just one tends to make them pugnacious. Referring to YT Damsels in particular. Fenner says keep them in odd numbers like three, or five, or seven.
My problem with Alan wanting to keep two is that he intends to keep them in a 33 gallon tank. I am just alerting him to possible problems. Remembering that once they are in, you have to tear the whole tank down to get them out if there is a problem.