According to the sign, this tank houses the following species: Common molly, leopard sailfin pleco, cardinal tetra, glowlight tetra, stonelapping minnow, red swordtail, freshwater angelfish, red-line torpedo barb, clown loach, and zebrafish.
However, I think the sign is outdated as I only saw a few of them (including one tetra species that wasn't signed) and there didn't seem to be enough space for so many of them to hide.