Entrance to the "Vivarium", the small Karlsruhe Aquarium. Is't not part of the zoo, its a seperated instituition, located at the Museum for Natural History.
Altough its a very small aquarium without big tanks, it contains an impressive colelcton of fishes, reptiles, amphibians and invertebrates and its famous for its sucessful welfare and breeding of corals.
They have plans for an expansion in the near future.