The sign on this exhibit was for False Gharial, which makes sense when looking at the enclosure. However, the aquarium must have been out of gharial as I saw two Sailfin Dragons sitting on a slab of cement.
@snowleopard I guess there were no snake-necked turtles as well?
I would guess the gharial are taken off-display for some reason (This was temporarily taken over by mudskippers at some point before the gharial returned). This is one the bad (If not the worst) exhibit in the aquarium with the lack of almost anything that makes a reptile exhibit barely feasible.