1. Illumination: If you want to raise green water, you must first provide sufficient illumination. Algae are also plants, which need photosynthesis for growth, and can't multiply in large numbers in dark places. Therefore, fish tanks must be illuminated for a long time, and they can usually be placed in sunny places, but attention should be paid to temperature changes to avoid excessive temperature difference between day and night.

2. Temperature: Because algae also have certain requirements on temperature, it can't be too high or too low, and it is usually better to keep it between 15-20 ℃. Of course, it is impossible to raise tropical fish at this temperature, but few people use green water to raise tropical fish, and generally raise goldfish.

3. Nutrients: In addition, it is necessary to cultivate green water nutrition, and it is actually very simple to provide nutrition. It is enough to rely on fish. After feeding it at ordinary times, its excrement is the nutrient for algae, so it is not necessary to clean the fish tank frequently, and the excrement is also conducive to algae outbreak.

Generally, turtles raised in green water do not need to deal with the excrement specially. Green water itself is algae, and ammonia nitrogen produced after decomposition of feces will be absorbed by it, which will not affect water quality, thus ensuring the safety of turtles. However, if the excretion is large and there is too much accumulation at the bottom, it may cause the water body to stink. In this case, it is necessary to filter and change the water in time and clean up the dirty things at the bottom.