Can you put dragon fish in with piranha?

It is generally not recommended to put dragon fish with piranha. Dragon fish can grow up to 40 inches in length and are known to be aggressive. In contrast, piranhas are known for their sharp teeth and aggressive nature. There is a high risk that the dragon fish would eventually try to eat the piranhas, while the piranhas would likely defend themselves and attack the dragon fish. Therefore, keeping dragon fish and piranha together is not ideal and could result in injury or death to one or both species.