Aquarium Sharks


I have never raised sharks in an aquarium but I have had this desire ever since I bought an aquarium. I want to try Rainbow Shark. Has anyone tried to raise aquarium sharks? What's your experience like. What kind of sharks did you raise in your aquarium?
I have kept small freshwater sharks. A long time ago and I can't remember the species. I do remember them being very skittish though. If you move suddenly they would panic and go darting around the tank banging into things.
It is said that aquarium sharks exhibit characteristics similar to actual sharks. Sharks are known for their fierceness and attacks and I want to know if these acquired sharks show the same characteristics. I have seen silver sharks in tanks and these are relatively bigger for home aquariums.