Yep. pH is the ratio of hydroxide to hydrogen. It actually stands for "power of hydrogen" (but in Latin originally lol).
That's why water, H2O in itself is neutral. It has one hydrogen, H+ and one hydroxide, OH-. In equal ratio, so they neutralize each other. Acidic or basic (I find is a better term) water occurs when there is no perfect balance, meaning almost always. Acid from more H+ and base from more OH-. Basic water, for reasons I'm not sure of, is sometimes called alkaline.
Hardness is the measure of minerals. Most often the minerals are calcium and magnesium (though others such as sodium also count towards hardness). Calcium and magnesium are both alkaline earth metals, hence the word "alkalinity." Much more appropriate in this case I believe.
Most often hard water will be basic, as the negative OH ions can more easily pair up with positive metal ions, you do get cases of soft basic water in nature.
WOAH CHEMISTRY LESSON. -smashes head against wall-
My water is at 13dH and pH of 7.5 and my CT is fine. Usually fry are much more likely to get curling as their fins are still less developped. But, my CT got fin rot, in like January, and only about 1cm of his tail has grown back. x.x Soft acidic water is more natural to them and helps their fins regrow better.
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