I live in LA, and Leopard Sharks breed in the local waters every fall, and then migrate up to the Pacific Northwest as they grow and go further into colder waters.
A few years back I had a 100g tank and decided to just keep one of the leopards that I caught (I usually just throw them back) and I kept him in a 100g tank for about a year, then I took him back and threw him in the ocean. They are one of the most amazing animals ever. However, even though you have kept leopards in the past successfully, doesnt mean you should. Leopards actually grow very slowly because they have a 30 year lifespan, however they will eventually outgrow your tank, then what are you going to do. Once a leopard shark is accustomed to being fed, he cannot hunt for himself, what happens then? A baby leopard is easy to care for and can live in home aquariums, as he grows, he will need much much colder waters, are you prepared for that? If you are, then thats great, Im just saying they can be tempting at first, but rest assured, they are not meant for home aquaria as they will eventually die in captivity. Local zoos and wildlife preserves will not adopt them because they already get millions of request from ill-advised hobbyists who are now stuck with a 6 foot shark.
I can catch them anytime off the coast in LA...just go out with your fishing pole to the beach, stick a blood worm on your hook, cast your line right after the wave break and walla, you have yourself a leopard. I dont go fishing for leopards, but I catch them all the time and throw them back. Stingrays, batrays, smoothhounds, tiger shovelnose sharks are abundant too....