Hope you did some more checking before buying a baby shark; this is info on a 700-gallon tank (US gallons aren't same as imperial gallons, but the difference isn't significant for that size aquarium tanks) considered too small to keep a shark - it would be cruelty:
....owner of Manhattan Aquariums, which sells tanks small and large from a showroom on West 37th Street..[..].... suspended a 700-gallon aquarium from the ceiling of a town house apartment in the West Village ..... The filled tank weighs at least 6,000 pounds and has cost the couple some $200,000 in equipment and service.
Furthermore, maintenance costs for replacing the water in the tank, food for sharks, veterinary visits etc for a 900 gallon (US) tank - minimum size recommended for single shark - start at $6,000/month.
... At first, the 900-gallon tank held a lone shark — her name was Ursula. When she died, she was replaced by multiple sharks that eventually outgrew the tank and were donated to the New York Aquarium ...
Last but not least, can your building's foundation withstand the weight of water involved in a large tank?
.. contractors use a special high-compression cement in the base, knowing he wanted to install a 700-gallon aquarium. It is six feet tall, eight feet long and about two feet wide..