1. Change the water frequently, and pay attention to the temperature change and transfer position. 2. The biological species should not be too single, and it is best to form a biological chain. It is found that if the water is not changed, the water will become more and more turbid, leading to biological death. Don't be too single, be more ~ ~ The environment should be stable: temperature, oxygen ... If it is aquatic, you should change the water frequently ~ ~ The creatures put in the ecological tank must have strong vitality and the number of creatures put in must be appropriate. In order to keep the sand in the ecological tank dry, a layer of plastic cloth can be laid under the sand to prevent the water (gas) in the tank from infiltrating. The stability of ecosystem is closely related to its species composition, nutritional structure and abiotic factors. The stronger the viability of primitive organisms, the more appropriate the proportion of organisms, the more suitable the environmental conditions, and the longer the life of the entire ecosystem. Put the ecological bottle in the sun. Note that the light should not be too strong, so as to avoid the high temperature in the bottle and affect the survival of organisms. ]