How can I get my piranhas to mate?

Answer 1

Piranhas are a schooling fish and spawn that way. you will need to have 1 or 2 female piranhas condition fed ready to breed and 3 or 4 male piranha at least. As they are a shy fish this will require an aquarium of at least 90 gallons (bigger would be better) and be prepared to remove the fish to another tank when the spawning is complete. good luck

Answer 2

Stick the fish in a bowl, leave them in the room, shut the lights off, and just let them do the rest.