Hard And Soft Water

Mick Frost

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Soft water is close to pure H2O, Hard water has more substances in it like minerals. Most fish can adjust, if it's done gradually (I have Shrimp at ~300ppm GH), but some more delicate species will either have sensitivities to high concentrations of certain minerals or will get pale/sick from a lack of them.
It's like how certain nationalities of people require more Iron or Sodium in their diet, and others are prone to suffer from Obesity or Diabetes from having abundances of certain nutrients that their ancestors had less of.
 

OneLittleBubble

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Every fish comes from a different environment with different water parameters, and some come from places with softer waters, while others come from places with harder waters. If it isn't in the same water parameters then it could stress the fish out. Especially if it is wild caught. Which most fish are.
 

Mick Frost

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LaceyRen said:
Hardness in water also changes your pH, the higher = basic, lower = acidic
Usually. With pure H2O, adding anything which raises PH will raise GH, while adding anything to lower PH will raise KH. By the time it gets to your faucet, there are so many of these things that found your way into the water that it's entirely possible to have 6.0-8.0 PH coming out of a RODI.
Moreover, GH only measures solids (suspended in the water, not dissolved) and KH only measures Alkalis. There is a general correlation though.
 
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