5 Most Dangerous Aquarium Fishes

Some aquarium fishes can be harmful due to their aggressive behavior or special care requirements. Here's what you need to know.


Known for their striking appearance, Lionfish are venomous and can pose a serious threat to other tank inhabitants.

Electric Eel

Electric eels are capable of generating a powerful electric shock, making them unsuitable for a community tank.


Known for their sharp teeth and potent bite, piranhas require careful handling and are not recommended for mixed species tanks.


While often cute, pufferfish can release a toxin deadly to other fish and humans if not properly cared for.


Arowanas are prized for their beauty but can grow very large and become aggressive. They are known to jump out of tanks if not securely covered.

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