This Guy Built A 20,000 Gallon Private Reef Tank

What’s the coolest thing you’ve ever built? This guy might have you beat with his 20,000 gallon, private reef tank. Bill Wann designed this entire 20,000 gallon reef tank himself.

From the filters to the pumps, he built everything at home in his shop. The tank is so large, that the only way to clean is jump in with scuba gear.