My aunt has one of those. I don't know how expensive it was but I would love to have one when I get a house. My dad always had one or two aquariums and I used to love sitting and watching them.
We've just had a couple of 75 gallon fresh water tanks and that was plenty of work for care and maintenance. To get the really bright colored fish, it's probably a salt water tank. That's even more time and effort for care and maintenance.
We had a 50 gallon tank and it was quite a bit of work. I finally gave up and sold it after my last fish died of old age. It was also quite heavy and actually bowed one of the floor joist in our house.