The temperature is generally suitable for lampreys. The water temperature can be kept between 22 and 28 degrees Celsius, and it is not necessary to keep it at a few degrees Celsius as some books say. In fact, as long as the temperature is kept within a certain range, it is not difficult to raise the fish of lamprey family. In addition to using heating rods in winter, the water to be changed should be heated to the same temperature as the aquarium when changing water. As for summer, it can be adjusted by coolers, cooling fans and ice cubes. Even without special cooling, the bottle fish will live well in your fish tank. When the water temperature is high, the dissolved oxygen will be greatly reduced. If the feeding density is high, we should pay close attention to the phenomenon of collective floating head of lamprey, which is especially common in late May, spring and early summer, and the weather is easy to get hot suddenly, so the owner should pay more attention. If necessary, it should be supplemented by an air pump to increase dissolved oxygen. As for 1 1 month when autumn turns to winter, the temperature difference between day and night is large, and the most common disease of lamprey is white spot disease. Water quality The favorite water quality of the bottle fish is slightly acidic soft water, and the pH value can be raised well at around 6-7. If the water quality can be controlled within the range suitable for growth and stabilized, the lantern fish will completely present its own unique beauty. In fact, at present, many lampreys are not caught from the origin. For example, there are a large number of artificially propagated species in Hong Kong. There are also artificial breeding grounds of lamprey (Hyphessobrycon flammeus and Thayeria boehlkei) in Taiwan Province province. Therefore, even if the water after tap water aeration and activated carbon filtration is alkaline and hard, it can actually maintain its vitality, but it is not sure whether it can show its unique beauty.