Addition amount and effect of trace elements in freshwater fish

How much should different trace elements (copper, iron, zinc, manganese and magnesium) be added to ordinary freshwater fish? What does it all do? How would you like to express your opinions? Copper, 5.5mg/kg, iron, 110mg/kg, zinc, 25mg/kg, manganese, 16mg/kg, magnesium, 65mg; kg, 16mg/kg; bone, immunity, growth. -- if the amount of zinc is low, it can be increased. Is the copper not low? And magnesium? I am a layman. Is it because of its high demand or low content in feed that magnesium is considered in fish feed? Crsshui personally thinks that iron, zinc and magnesium are all a little low, and copper can be reduced a little bit. Stupid opinion! Ask for expert guidance