Now let's start with the breed you want instead of just general shark anatomy, the bamboo shark. First the are extremely messy, eating live or frozen food, up to a half pound to a pound a week. An rember you can't use a canister on a saltwater tank as they are nitrate traps.
Next this one reaches a min of 3.3ft, reports of it growing larger as been reported an you can even view this in serval public aquariums. it is easily scratched by objects in the tank causing easy work for infections to set in, and sense no scales copper meds an not be used to treat. Now since it is so easily scratched, you have to remove most if not all rock work from the tank, which means you lose a major filtration factor and so on, once again sharks are waste factories
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36 gallon fresh water