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I keep soft, acidic water fish which matches my tap water perfectly which is 1.8 to 2.5 dGH (degrees General Hardness) throughout the year.
However, this is too soft for plants which need a little bit of hardness in the water to get calcium, magnesium, and potassium. I use Flourish Comprehensive for my fertilizer, but it assumes that you have those three elements in abundance in your tap water because most of North America does have medium hard to hard water.
I needed something that would raise my GH, while not changing the KH and pH. I need a low KH so that my pH stays low. If the KH raised the water would have more buffering capacity and my pH would rise to my tap water's 7.6 instead of staying at the 6.4 my tanks have established at.
For dosing I use the API liquid GH test kit to determine the hardness of my tank's water. I then follow the dosing instructions on the bottle to raise my GH until it's at 4-5 dGH. Still soft water, but not so soft the plants suffer. I put the Equilibrium into a 1 gallon water jug, fill with tank water, then shake to mix it a little before dumping back in the tank. Not all of the minerals will dissolve, so you'll see solid chunks float down to the bottom of your substrate. That's all right, and they'll fully dissolve within an hour. It's not a problem if your fish pick at it thinking it might be food, it won't harm them.
For measuring I use a scale that measures in grams. It allows me to get a precise amount of Equilibrium without having to try and guess how much fractional tablespoons would be.
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