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Pufferfish Palace

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America's oldest zoo wants their newest addition to be an forgotten slice of history with an elaborate coral tank. The Philadelphia Zoo is implementing a new exhibit geared towards children to demonstrate the importance of preserving underwater habitats. To do this, they want to bring to life what has long been dead - a pristine coral reef, untouched by mankind.

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Mat is stunned to find himself literally standing on top of one of the most unique aquariums he's ever encountered when he arrives at a home in Key West, Fla. Below him is a 25,000-gallon saltwater lagoon that has fallen deeply out of care. What once resembled a vibrant reef is now a murky puddle with algae-caked corals and brown water. The tank requires lots of labor to reclaim the beauty it once boasted.

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