Not caiman, but Randers Tropical Zoo in Denmark had red piranhas in their Cuban crocodile pool for some time. Later the piranhas were moved to a smaller tank that has housed many different aquatic animals since it opened. It housed red-eared sliders at some point and I believe they lived with the piranhas for a few months before they (the sliders) left the collection. But I'm not entirely sure.
Cameron Park Zoo had them with Amazon Tree Boas and Emerald Boas in the past. And I've seen them with Yellow Anaconda, but don't remember the exact zoo.