Most likely Francois', as silvery is already exhibited elsewhere in the building. Personally, though, I hope the exhibit is renovated a bit first. It isn't bad, but the climbing structures are all on the same level, so there's little variation in height. What are some other interesting species that could go in there?
Animal World and Snake Farm Zoo has this species, and I believe they're in a few other institutions as well- California Academy of Science perhaps?
Minnesota Zoo has I believe three individuals. Not sure why you made the unnecessary exclusion of aquariums, but the New York Aquarium might have one still, and I believe the Georgia Aquarium has one as well.