are you looking for a real nurse shark? or a sand tiger shark? (sand tiger sharks are often referred to as nurse sharks also )because that is what they are called in OZ. and that is where they are typically filmed. However they live here also. Same thing with zebra sharks, (called zebra sharks in the US but called leopard sharks in OZ) when they are born they are stripped like zebras but as they age their stripes become spots and they get a leopard print.
Depending on if your looking for a legit nurse shark or a sand tiger will let me know what minimum tank size you need. (nurse sharks have their mouths near the bottom of their head and often eat off the bottom. they have large heads in comparison to the size of their bodies and dont get as large as a sand tiger. sand tigers are basic shark shape and all their teeth are usually showing as they stick out all the time giving the impression of a smile. both are actually pretty docile to swim around however sand tigers look really mean.
tank size for nurse shark I suggest minimum 50,000 gallons
sand tiger I suggest minimum of 100,000 gallons