You never see aquarium tank that bigger than your house? World 2nd largest aquarium, The Churaumi Aquarium in Okinawa (Japan) is 10mx35mx27m.
The aquarium tank is so huge that they name it as sea, Kuroshio Sea. What fish to rear in this huge tank? Definitely not golden fish. You can’t even see the small golden fish in the sea.
See what they rear inside?
Just imagine the thickness of the glass. What happen if the glass broken?
PS: The tank size is capable to hold 4 Whale Sharks!!