I haven't been to Sioux Falls in Years, I didn't realize they have an aquarium. It's a beautiful picture!
I used to go to some fish store in Sioux Falls, it was huge! I used to go there just to look at all the fish, especially the saltwater fish. It was located by the zoo not too far from Sherman Park.
RE: Here is another pretty underwater photo of my trip to the Souix Falls Aquarium.