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That's it!

You mean if the water in the tank got evaporated you use only RO WATER?

How to water change masters? Do i need to mix again the minerals or its ok just ro water?

These all raise GH.

I have questions masters What minerals that increases the gh? Is that the calcium sulfate, magnesium or potassium?

I add minerals on my tank and its now around 80tds and the gh is 4 now if i still add minerals on it and make it 100tds theres posible the gh will become 5gh. Is that ok that i set it in around 80?

The remineraliser you are using for will increase GH. And since it's easier to measure TDS with a TDS pen, we ask you to raise TDS to a certain point to get (close) to the desired GH. SO yes, TDS is important. But so is GH, KH, pH and temperature. The point is not one parameter is more important than another. They all work together to get to the right parameter for shrimp or fish. If anyone tells you that one parameter is more important than the others, RUN away.