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Best way to raise GH ?

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As the title says what is the best way of raising the gh in my tank where I live I'm on rain water and the water is very soft under 100ppm I'd like to raise it to 200-300 what would be best to do this fish in the tank is a mangrove jack thanks

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Standard sea salt sold for human consumption is sodium chloride.

Therefor it will not effect GH.

Epsom salt is magnesium sulfate, so adding it will raise the magnesium.

Therefor it will raise GH.

Coral is calcium carbonate, so as it disolves it will raise the calcium.

Therefor it will raise the GH (and the KH, as the KH is carbonates.)

Adding proper marine salt, such as that used for marine aquariums, is the best solution IMHO

as it raises GH, KH, salinity AND it raises them in the correct proportion.

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If you have room in your sump a mix of coral, oyster shells, and crushed limestone. Best limestone to use has dolomite, Calcium carbonate and Magnesium carbonate together. Sure I have posted this before somewhere. Pic of a drum set up for a pond not in use atm, crushed coral in bottom dolomite limestone in middle and oyster shells at the top easy to set up a sump chamber like this.

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