Beautiful is not the first word that pops into the mind!
Someone has translated the Aquarium into Russian. In addition, they have replaced the fish with new textures. I have to tell you, I don't think there's a single fish in there I'd want swimming in my tank. They are all freshwater species that I have been able to determine.
Obviously you and maybe others have a differing opinion?
It is important to note that all of these downloads still require a registered copy of SereneScreen Aquarium. The protection was not circumvented. Actually "TESTFISH" was removed.
Some of the fish can be seen here: