The AquaDom is a big cylinder with a height of about 14 metres. You can take a slow elevator in the inside to take a closer look at the fish (but of course you have to pay for that amusement). This aquarium is located in lobby of the five star hotel 'Radisson SAS'.
To get a ride you have to pay much money and take a trip through the crowded SeaLife aquarium. They show you the typical fish of German waters in nicely decorated basins. Sadly there isn't very much space available in a ground floor of an office building. Worst thing there aren't all the children around your feet, but their mothers with the buggys on your heels.
In my opinion your time and your money are better spent at the Aquarium Berlin.