11-14-2013, 01:05 PM
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Most freshwater fish we keep will adapt to our source water pH and hardness without issue.
Very few FW tropical fish need the pH and hardness changed to be successfully kept, however, to stimulate spawning, egg development and G/D of eggs/fry with soft water species will need the water changed to meet their needs-but once the fry are at a certain stage-they can be changed back over to your source water after proper acclimation.
To change the pH-you usually will have to change the hardness-otherwise you will have rebound issues that are stressful on the fish.
Best way to change the pH and hardness without rebound problems-Is using R/O water or rainwater (rainwater can vary in chemistry and safety-always test before use)
IME-I don't change the water chemistry to keep my Neon tetras, however, I do have to change it when I want to spawn them and a few other softwater species I keep-I have very hard well water. (pH 8.8+/over 300 KH/GH) I don't have problems keeping them in my well water.