Always loved them but don't want to clean or maintain them. My uber rich customer had a salt water tank built into his house. 500 gal or so. Talking with the guy, he spent over a million dollars in ten years on that aquarium. Some are just over the top.
Extremely expensive to maintain and keep looking good. We have made a few, but fixed allot more. I have been in the dolphin tank and the Beluga whale tank at Seaworld fixing and polishing windows. I have done allot of work for Legoland Aquarium and also for Labs that do cancer research using certain seasnail DNA where they have large saltwater tanks. All I can say is , I would never own one myself. Never ending expense to take care of.
Saltwater tanks are crazy money over time. Friends Dad had a company years ago that sold the Saltwater. He did really well until they tried a new venture. Collecting and selling corral. It pretty much drained him. My 2 buddies got some good traveling adventures out of it. Never was profitable.
I was into fish tanks for years. My last tank was 240 gallons. I had 12 red belly piranhas I got from a friend that outgrew his tank. Lots of live plants and geodes from the store natural wonders a friend managed. Some day I will have another but it will be freshwater.