I visited recently and the sand tiger sharks in Sharks: Predators of the Deep weren't on exhibit and according to the educator speaking in the gallery that day, it seems they won't be returning. From what I can recall, the sand tigers techncially weren't theirs, and there were some issues with the silky shark recenly added and the sand tigers, and he said had the sand tigers gotten hurt in any issues, the aquarium could get in trouble, so they were removed entirely. He says they don't see it being likely they'll be back either, as he pointed out which is when I noticed, all signage for sand tigers in the gallery has been removed. Tiger shark is still there and growing.