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To raise the KH add baking soda at the rate of 1 teaspoon per 30 gallons. This will raise the KH by 2 German degrees of hardness, which is equal to about 35 mg/l.
For a 12 gallon tank I would try 1/4 tsp. and allow that much to dissolve and circulate, then test the KH.

Potassium bicarbonate will also raise the KH. It is dosed a bit less than baking soda. It would be OK to try 1/4 tsp and check the KH.

Either of these materials dissolve very quickly. You could shake some in a jar of water and spread it over the water surface, it will mix quickly, and you can test as soon as it has circulated.

When altering the TDS (Total Dissolved Solids- which includes the salts and minerals we are talking about, make small changes, let the fish adjust for a week, then another small change. Also, some of these materials are used by the plants as fertilizer, some plants can use the carbonates as a carbon source.
So dose, then run it for a while, see the overall result before you adjust the dose.
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