More Than 1 Crayfish In A Tank

Guppy43

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I just bought a new female red swamp cray for an empty 15 gallon tank but now I have this crazy idea.

I also have a male cray I adopted from a friend 2 months ago. Can I mix my new female with the male?

He(my adopted “son”) currently live in his own 20 gallon aquarium along with a male playfair panchax and 5 swordtails. He’s quite passive-aggressive I’d say as he sometimes raises his claws when I approach the tank but he has never killed a fish even when the panchax swam right up to his face.
 
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