my city water is horrible. I wouldn’t even attempt to use it for freshwater tanksfor those corals I wouldnt really worry about amino acid dosing. More important is keeping levels stable and within known range of ideal water parameters. Nitrate, phosphate, calcium and alkalinity are the most important to have good test kits for (not API test kits). Magnesium is good to have too but i dont feel it is as important to test as frequently as the others. Good test kits include hanna, red sea pro, salifert, etc.
When looking, search up your cities water quality and what they add to the water. If they add chloromines you need a specific carbon filter for that but not everywhere uses chloromines