Looking at this tank, thee fish reminded me of Mon Calamari from Star Wars spaceships floating in one space.
I have not visited an aquarium in years. Stralsund has a marvellous sea museum dedicated to sea life over three floors. The curved building opened in July 2008 on the city’s waterfront. The Ozeoneum is opened from 9 to 8. Expect long lines dues to Social Distancing rules.