A reef shark cost around 4-450 bucks. The bumping of tank only happens during acclimatize of the shark and after which, they get used to the tank after a few days and lightings are important for them during familiarization of their new home.
They are not a messy eater. MP will do good. Sharks belongs to the ocean, if this is a statement, same goes to coral and marine fishes. size is one thing but taking good care of it like a pet is another. If you keep marine fish and coral but not taking care of it, any difference? Simple, want to save and protect, do it for all. And for baby reef shark, normal birth rate is around 5-8 babies per pregnancy. Usually est only around 3 will make it because the rest will either be eaten by their mom or other predators. This is their cycle. You may just save another one if you have a good tank and take really good care of it.
The species that really need to keep moving is hammer head, not reef. Hammer will get drowned by the overturn of water current if they stop moving. In fact, you see reef resting at seabed sometime, of cause not always.