Xiang Hai said that the marine intelligent ecological tank can't raise freshwater fish. For Xianghai, the marine intelligent ecological box is an intelligent product suitable for cultivating marine life, and its design and function are to simulate and maintain the marine ecological environment. So it is not suitable for breeding freshwater fish. The physiological structure and survival requirements of freshwater fish and marine fish are different. If freshwater fish are put into sea water, their cells will expand or contract due to the different osmotic pressure, causing serious injury and even death.