A sign about Lionfish, over a tank that does not contain Lionfish. The tank is now home to several striped burrfish (Chilomycterus schoepfi) instead.
I am assuming that the tank once did contain Lionfish, and if so, the signage is now outdated. Of course, there is also the possibility that the sign was never intended to correlate with the tank’s inhabitants in the first place (but I would also find this odd).