Puffer fish are fascinating little creatures that can puff up like balloons when they feel threatened. While they're often seen in the wild, freshwater puffer fish can also make unique and lively additions to an aquarium. These fish have a quirky personality, but they do require special care. A puffer fish aquarium must have plenty of space, clean water, and the right diet to keep them happy and healthy. If you're planning to keep one, make sure to research their needs to create the perfect environment for your new finned friend!