I agree, but your tank is over 1000 gallons. Most people want to throw a shark into a 180 and call it a day. Some people even told you not to put a shark into anything smaller than 7000 gallon tank. Than you got the Shark police along with the Tang police that say don't house a shark at all.
Most people never see a fully grown Cat Shark, or Bamboo Shark. My 55 gallon tank is about the size of a fully grown Cat Shark or Bamboo Shark. That's 4 foot long, and that can't swim well in a 180 gallon tank. I don't know why websites say that they can live a full live in a 180 gallon tank. Live Aquira is usually really good about tank sizes, but they say a 4 foot shark can live a happy live in a tank that is only 6 feet long?
The pool idea is not the greatest, but it's not the worst idea. Your talking about a 10,000 gallon set up with proper filtration and heating and lighting. I have seen it done, but by the time your finish it still cost a lot to do right. So I personally never saw the point. You can only look down on it. I would build a custom tank for my Sharks if I ever decide to do so. It would be way longer than 6 foot, and only about 2 to 3 foot deep. I know what it takes, and that's why I have not done so yet. It cost too much, even if it's a DIY Project. I was just saying the pool makes a great swim space, but you still have to pay a lot of money for filter, sump, heating, lighting, sand, rock, and food.
So in the end, it's still not a great Idea, but it's better than a poor shark in a 180 gallon tank.
Fish Sticks, the best thing you can do with your dead fish.