The heating rod plays a role in keeping the water temperature in the aquarium constant and keeping it within the temperature suitable for feeding fish. It is very important in the Aquarium. If the heating rod in the Aquarium has a problem, stops working, and is not found in time, and the fish being fed is just a sensitive fish like the dragon fish, then the dragon fish will be uncomfortable or even sick due to the rapid drop in water temperature and huge temperature difference, If the problem with the heating rod is that the water temperature cannot be maintained at a constant value and kept in a heated state, the fish will be even more dangerous. If it is not detected in time, the fish's condition will be very bad. However, if the heating rod is not prepared for temperature, sensitive fish like the dragon fish will also experience discomfort and illness due to the disorderly changes in water temperature. So during the breeding process, it is important to regularly observe the heating rod and pay attention to the degree on the thermometer.

According to its principle and structure, heating rods can be divided into two types, one is electronic type, which uses thermistor to detect and control temperature, and the other is Bimetal mechanical temperature control heating rods. The first type of heating rod has accurate temperature control, and its price is slightly higher than that of ordinary mechanical heating rods, but its price is relatively higher. The disadvantage is that it has a complex structure and is equipped with peripheral devices such as probe sockets. Another kind of Bimetal mechanical temperature control heating rod is more common. The Bimetal is a kind of Bimetal made of two different materials, which is combined by a special process. When the temperature changes, the metal sheet will be deformed according to the temperature change due to its different expansion coefficient. The Bimetal is used to place one inside the heating rod as a contact switch, which can automatically disconnect the contact for temperature control after reaching the temperature. It has the disadvantage of inaccurate temperature control. The Bimetal and its temperature control contact inside the constant temperature heating rod are the control core of the heating rod. Poor quality Bimetal is prone to fatigue in the use process, which leads to the failure of Bimetal to open or close the heating rod with the change of temperature. In addition, poor quality contact opening and closing are also easy to ignite and stick, causing large temperature fluctuations, thus affecting the fish.

Generally, it is recommended to replace the Bimetal heating rod after two years of use, because the Bimetal inside it has been used for a long time and is prone to failure. If it fails, it is bound to be caused by various problems of the heating rod, because it is recommended to replace it within two years, while some heating rods may fail or be damaged before two years of use. It is recommended that the owners keep spare heating rods at home, Avoid situations where the heating rod suddenly encounters problems and becomes helpless. The power of the heating rod to be used in the Aquarium is determined according to the amount of water in the Aquarium. Generally, one liter of water is better than the 1.5W-2W heating rod. With this ratio and the amount of water in the Aquarium, we can know how much power of the heating rod to be put in the Aquarium. If 500W heating rods are needed, buy two 300W heating rods and place them at both ends of the Aquarium, which can be heated evenly. If one of the heating rods has a problem, the temperature will not drop too much at once, which is good for the fish. The heating rod can be placed in the main cylinder, and some breeders also place it in the bottom filter.