'Salt' is sodium chloride. Table salt, Kosher salt, water softener salt...
This is the one that some fish cannot handle well. It will raise the salinity of the water, and this can be measured with a hydrometer or TDS meter.
'Epsom salt' is magnesium sulfate. It is a good source of magnesium for plants, or for fish with constipation. It will raise the GH of the water. Fish that are sensitive to sodium chloride usually can handle Epsom salt just fine.
They are used for different purposes.
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