The reason why the newly bought fish will sink to the bottom is generally because the water temperature is too low. Eurythermal fish have a wide range of adaptation to temperature, so low temperature has less impact on them, but if they are tropical fish, the situation is different, they must maintain the temperature between 20-30 degrees Celsius, otherwise the fish will lie in the tank.
The water quality is not good, the fish will not like the activity, thus causes it to lie down in the tank bottom. This situation is generally easier to find, in addition to the tank, the water quality will be very turbid. If you want to improve, you need to change the water regularly, usually once a week, a quarter of each time. In addition, strengthening filtration can also prevent the occurrence of such phenomena.
Different fish show different conditions for oxygen deficiency. For example, goldfish tend to float their heads, but some fish sink to the bottom and are not very active. In view of this situation, it is necessary to oxygenate the water, you can use the oxygenation pump to charge 2-4 hours a day, summer or continuous cloudy days, you can charge for a period of time.
If the fish has a stress response, it may also sink to the bottom, which is mainly due to fluctuations in water quality or temperature, or changes in the environment, such as changing a fish tank for it. Don't worry about this situation, it will recover after a few days of rest.
