1. We must first establish the ecology of the fish tankWhen many people first want to raise fish, they are usually motivated and rush to buy the fish tank When he came back, he hurriedly added the water, and hurriedly released the fish. Of course, the fish also hurriedly fell ill and died. A. First of all, don't be impulsive, buy the fish tank, put the water first, set up the filter system, filter cotton, biochemical cotton and the place where the nitrifying bacteria should live (such as biochemical ceramics, biochemical balls) are placed first, don't do it first Put any chemical substances (water quality stabilizer or high wave), and do not put nitrifying bacteria, and run the whole tank of water for three days first, because the chlorine gas is removed first (if there is bottom sand, impurities can be removed by the way). B. Next, you can put nitrifying bacteria. Generally, nitrifying bacteria are photosynthetic type. Add about 2 times (the standard amount marked on the bottle), turn on the light and do not turn it off, and cycle for three days. Allow the nitrifying bacteria to live in your tank's filtration system and in the bottom sand (if any). C.  Go to the market to buy a few clams, remove the shells to expose the clam meat, put them in the aquarium, and observe for three days, if the clams are in a rotten (corroded) state, it means that your aquarium is damaged. The basic ecology has been completed, the nitrification system is on standby, and you can put fish at any time. 2. Have knowledge of fishOf course, for the colorful gods, when buying fish, pay attention to whether the fish is healthy and whether the fish is taking a medicinal bath. Please pay attention to the following points: . Whether the eyes are cloudy, the cloudiness is mostly caused by poor water quality. A. Whether the eyes are dull and dull, most of them are infected with internal worms. B. Whether the operculum of the fish is everted, most of the fish that are everted are infected with gillworms or have been infected with gillworms. C. Whether the fish has abnormal mucous membranes, if there are abnormal mucous membranes, it may be infected with bacterial diseases. D. Whether the fish are healthy and energetic, most of the healthy and energetic fish will swim in groups when they see people approaching and appear as bait. E. Ask the boss if he is taking a medicinal bath. The water quality of the fish tank in the medicinal bath will never be clear and transparent. If the water is cloudy and the boss firmly denies that he is taking a medicinal bath, then you should not go to this store. Because the boss doesn't even know how to keep water, and the fish he sells won't be healthy. F. Go to a store with stable quality to buy colorful, I would rather spend a little more money to buy better quality fish than buy it and use it all day long. G.  When buying fish, remember to ask about the origin of the fish, the age of the fish, what kind of fish the previous generation of the fish was, and whether the proportion of the eyes of the fish is normal. If the proportion of eyes is too large, it is usually a small fish. Of course, some bosses won't tell you about this if they don't know you well. H. Don't buy very expensive fish, expensive fish is usually a hype, don't spend too much money to take advantage of it. If you really like it, please compare the price before buying it, or log in to the flea market to find fish. I. It is best not to rashly put it into the tank after buying it. The fish will have unexpected situations when they enter a new environment. Put it back into the tank. 3. Have spare water for raising. To develop the habit of reserve water, at least a safe amount (1/2 of the original fish tank water), the water preparation method is very simple, As long as the pumping equipment has been pumped to remove chlorine. It is recommended to buy a large water tank (the plastic white one, I think the capacity is about 2 or 300 liters, the price is not expensive, plastic and hardware stores sell it), and then prepare a pumping device and a water pumping device< ;Pumping motor, small submersible pumping motor>, a plastic tube. ****Usage: Fill the water tank with water and use the pumping equipment for 2-3 days. At this time, the water has fully discharged harmful gases and can be used as backup water. Then connect the plastic tube to the pumping motor and pump the water into the fish tank, so there is absolutely no problem, and the fish will be in better condition. ****By the way, it is more convenient to use the water pump to change the water. A. If there is no water, it is best to prepare a set of pre-filtration system. Generally, it is better to have more than three sections (5mirco filter, activated carbon, cation exchange), do not use reverse osmosis pure water machine, because after reverse osmosis , the original beneficial minerals in the water will be purified, but the original meaning will be lost. B. If there is really no way to reserve water, then you have to spend more money and add water quality stabilizer every time you change the water. When adding water, pay attention to adding water quality stabilizer while adding water.