Behavior in the wild is not behavior in an aquarium, first off. There are many schooling fish that will kill conspecifics in an aquarium--even a large one. Eating behavior in the wild is seldom seen in the home aquarium, especially for piscivores.
Water quality is the other key aspect. We can never really duplicate the water quality found in the ocean--unless you have access to clean ocean water and can do daily water changes, it's not even really close.
Sharks are one of the more difficult animals to keep successfully. Pleas be patient, and do tons of research, before buying one of these animals.