The National Aquarium in Baltimore says it spends $45 million in annual operating costs on important upkeep like dive cleaning, filtration systems and feed for all kinds of fish.
WSJ visited their Blacktip Reef exhibit to see what it takes to maintain a 270,000 gallon tank and keep over 600 animals like sharks, Australian whiptail rays and Queensland groupers alive and healthy.
0:00 Over 600 animals live in this tank
0:38 Dive cleaning
2:08 Filtration systems and replicating sea water
3:35 Feeding and training the animals
5:58 Adding animals to Blacktip Reef
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