Kuhli loach (Pangio kuhlii) also named as coolie loach is a peaceful ground fish which is more active in the evening and at night.
Kuhli loach is an “owl” therefore it’s activity can be observed during twilights and at night, it is always hiding. The fish can hardly be seen at day time, especially when it’s kept in a tank alone, however it’s not impossible, if one watches the fish for some time.
If several fishes are kept in a tank they become more active at day, maybe due to the appearance of food rivalry. A group of dozen kuhli loaches will have more active behavior and it’ll be more close to their behavior in the wild, nevertheless Pangio kuhlii can be also kept alone in a tank.
The fish is rather enduring and it can live in a tank for quite a long time and it won’t suffer because of the lack of company. Also fishes from loaches family are known as weather forecasting fishes – they react on atmospheric pressure change and start going crazy, swimming actively along the tank walls or in circles.