I have a male Mandarin and got a female from a tank shutdown(Two years ago) I was hesitant to add her but I did and it took about 3 days before they decided to swim with each other and a further week to feel comfortable with each other. Until that time they slept at opposite ends of the tank.
While they swam and ate together and did some interesting swimming after dark they never produced eggs that I am aware of. About three months after coming to my tank she died still not sure why or how she died she was healthy and had good colour but one day she was alive the next she was dead.
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 My aquarium is nothing but a smorgasbord for my cats.....
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