? The fish tank thermometer is generally not poisonous, because the aquarium thermometer is generally used, which is different from the mercury thermometer. It is filled with alcohol. If it is broken and leaked, the water can be changed appropriately. In addition, there is a commonly used thermometer that is kerosene. It will form oil flowers on the surface of the water, which need to be washed off in time, otherwise it may pose a threat to the health of fish. If it's a mercury thermometer, the damage is a threat.
? 1. Guppy: Guppy is one of the common small tropical fish. It has many kinds and rich colors, especially its tail. This kind of fish has certain requirements for water temperature, usually above 20 degrees Celsius, but its adaptability is strong, and the low temperature of 16 degrees Celsius will not let it die.
2. Angelfish: Angelfish, also known as angel fish or swallow fish, is a relatively common tropical fish, native to South America. This kind of fish is suitable for living in the environment of 26-32 ℃ and has a certain sense of territory, so it should not be mixed with other small fish. It is generally divided into three strains: short-tailed, medium-long-tailed and long-tailed, and the species are also very rich.
3. Arowana: Arowana is a relatively primitive freshwater fish with a relatively large body and a life span of up to several decades. At the same time, it is ferocious. It mainly feeds on animals such as fish and shrimp. It must survive in an environment of 24-29 ℃. Its adaptability is also good.
