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This subject was covered at length in this thread if you'd like to read all of the opinions.
http://www.thereeftank.com/forums/f6/water-change-now-152987.html
In a few words, what it comes down to is the quality/purity of the water, and how good the salt mix is (aka how well/quickly it dissolves).
Even under the most urgent emergency I'd never wait less than 1 hour.
http://www.thereeftank.com/forums/f6/water-change-now-152987.html
In a few words, what it comes down to is the quality/purity of the water, and how good the salt mix is (aka how well/quickly it dissolves).
Even under the most urgent emergency I'd never wait less than 1 hour.
