Pangio is a widespread genus of small, eel- or worm-like loaches from Southeast Asia. Kuhli loaches are reclusive and nocturnal, although having a large group of them and plenty of hiding spaces make them more outgoing. You may not see your Kuhlis all day but they are known to go crazy when the aquarium is fed! Kuhlis prefer a soft substrate in which they can burrow completely, and act more comfortably and naturally in setup with such. They also appreciate thick leaf litter and sediment layers in blackwater-type aquaria.
These are large adults of the Chocolate, black, or Javan kuhli loach, P. oblonga. They are around 3-4" long.