Using an aragonite substrate is another option that can stabilize pH. Crushed coral is always a great option. As suggested above, measuring your GH and KH is a good next step. To answer your original question, yes, salts are used. Which to use and in what quantity however is more a matter of trial-and-error. In general:
Epsom salt increases GH and does not significantly alter pH or KH.
Baking soda increases both pH and KH. It doesn't alter GH as dramatically.
Commerically available cichlid salts generally increase all three parameters but to a lesser degree than either straight baking soda or Epsom salt.
I'm not sure what he meant by "sea salt". Based on your KH and GH readings and your desired water parameters, you can experiment to find the right amounts to add. Understand that with each water change, these solutes will be removed. As a result, you may need to add them back into the tank as some percentage corresponding to the water volume removed. You may be golden simply by using coral for example.... but you won't know until you measure your water parameters.