pH crashes are real. Think of your favorite carbonated beverage with a pH ~3.
http://www.21stcenturydental.com/smith/pH_drinks.htm
You can also figure that a KH of 3 is safer via buffer chemistry:
http://en.wikipedia.org/wiki/Buffer_solution
Being contrarian is cool and all but at least get the chemistry right.
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Originally Posted by fresh_newby
Whenever someone told me I had to adjust my kH or I would have a pH crash, I thought...that is utter BS. Makes no sense. In my belief, CO2 will only get your pH down so much, so how far down would it crash to? I believe 5.5 is about the limit, and with surface agitation and/or airstone, this shouldn't be a big deal, just remove your snails so their shells don't erode. I moved mine to my outdoor "pond"
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