I`ve had this happen a few times over the past few years and i just separate them. I have one male Pastel in particular that is real finicky about his girls. I put a large girl in with him the other day and he threw one of his fits. This time i left them together and they were hooked up the next morning. I don`t know why they do it, but in my case they are positively male/female pairings.

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