First of all, it would depend a lot on the astrological sun sign of the great white shark that you adopt. I would also recommend checking your astrological compatibility prior to adopting. Just like with adopting children, there are some sun signs that are incompatible with others, and you may run into issues as you try to raise your shark in the most suitable environment possible.

If your shark is a Cancer astrological sign for example, then it may not require as much space, since Cancers are known as being home bodies, and are perfectly happy lounging around the tank in their underwear or watching TV. However, Cancers can be a bit crabby, so I wouldn't put your hand too far in the tank when it is feeding time. If your shark is a Libra, you may need a bit larger tank because Libras are known to be a tad indecisive, and she may need to wander back and forth or around the tank for awhile before she makes up her mind about what to do next. If your shark is a Sagittarius, you will in fact need a VERY large tank, possibly one with tunnels that could lead him directly to all of the cute girl sharks in the neighborhood with the freedom to roam as much as he desires. I personally would not recommend a Sagittarius shark for this reason, but they can be a lot of fun, are very spontaneous, and he will always have the best party ideas if you want to entertain the neighbors.

If you really love sharks, you could just settle down with one or watch them on TV. I think Barbara Corcoran may be single (She is a Pisces.). Her net worth is over five billion dollars, but she has been married unsuccessfully in the past (Her husband left her for his secretary, and she wound up with a lot of his money.). I think Kevin O'Leary is attached, but with his attitude, who knows how long that will last. You might want to get in line now. The Shark Tank that I have seen on TV is not as big as you might expect, but just as dangerous.

You could also have a Shark tank wedding and get married amidst some real Great White Sharks.

http://cache.boston.com/resize/bonzai-fba/Globe_Photo/2008/07/12/1215908515_4067/539w.jpg

The average Great White is about 15 feet (4.6 meters) in length, though sometimes you can find one that's up to 20 feet (6 meters) in length. If you just want to "cage" the shark, a 20 foot-long cage should do the trick, but it might get bored swimming in tiny circles! You might want to get a tank at least the size of a swimming pool for them to peruse.

Sharks are also partial to sea lions, turtles and otters, but they will occasionally scavenge for meat. You should be good with feeding it some fish chum, though I'm not a marine biologist...

The Great White shark has been kept and displayed at the Monterey Bay Aquarium in its million gallon tank. They have had several over the years. They do not keep them for long. They catch relatively young and small ones, keep them a while, and then tag and release them for research.

The main problem with Great White sharks is not their size but their personality. Even well fed ones attack the other fish even in such a large tank.

But back to your question:
"The aquarium’s million-gallon Outer Bay exhibit was designed for pelagic (open ocean) animals like white sharks. It is home to Galapagos and scalloped hammerhead sharks, as well as large bluefin and yellowfin tuna, barracuda, and other species."
They seem to be the only aquarium that has tried it. I doubt a smaller tank would be much good, and it would have to be even bigger for a full grown adult. Lots bigger.

If ever you have enough money to house a shark...you need a tank or pool...which would measure something about 1,000 square meters...and that's on the small side of things...

Great Sharks does not fare well in captivity. so it's not worth the idea...

i kept sharks but only the small ones...they fared well but not on aquariums i usually housed on concrete-tiled ponds which measures about 10 meters x 10....

i am a tropical fish breeder so it's quite natural for me to keep these.

but i keep another fish somewhat similar in size but it's freshwater.....Arapaima Gigas which grows up to 15 feet long but less lethal than a white shark...

i keep them in earthen ponds....the ones they use for commercial aquaculture purposes.

i keep a small batch of 26 fishes which are approx. 5-6 feet long....5 years old. i intend to study these fishes for breeding...purpose for conservation. not for selling.

you shouldn't keep great white sharks in tanks....they will not last at all...no aquarium had ever successfullin keeping them alive....

so better think of something else....maybe conventional in size....it would be cheaper.

An aquarium located at Marine World or Sea World. That would be where to keep a pet shark. And, you should have a school field trip or a family trip to visit. And, they can teach you all about sharks. And, they have special marine life biologists who can tell you all about sharks, safety, what they eat, where they live and so forth. And, they have very big aquariums with large windows so that you can see them up close, and probably even throw them a few fish. And, you can even work there when you get to be old enough if you are still interested in them. And, you can also learn about scuba diving, and how to be safe in the ocean where sharks mainly reside.