The new electric eel exhibit, which took over the space previously occupied by 3 small aquariums for ghost knifefish, angelfish and discus. A huge improvement over the old exhibit (which now houses the ghost knifefish) Wild Amazonia - Amazon Flooded Forest | ZooChat
that's much better than the old tank! From this perspective, at least, it still doesn't look like there's enough length - it looks like the tank comes forwards though, rather than being straight? - but overall definitely a huge improvement and the tank itself looks great.
EDIT: I just saw the other photo of the tank from the side, and it is much bigger than the front view suggested to me. I like it very much.