For research last weekend, I visited one of the BEST AQUARIUMS on the planet!!! The Georgia Aquarium in Atlanta, Georgia! Check out this sketch I did there. Those proportions are correct! And yes, they have actual WHALE SHARKS in a 6.3 million gallon tank!
We had an amazing behind-the-scenes tour, which included seeing how their biologists feed the whale sharks with scoops of krill from boats as the tranquil sharks trail behind, and the massive operation of creating and cleaning millions of gallons of salt water every single day.