I can't disagree more. Guys I feel like your giving false information here. It's not a good idea to say things that your not 100 percent sure about, you may mislead this person. The ph change is 10 times more harmful than the chemicals. Ok the chemicals are completely harmless to the fish. 100 percent harmless and stress free. These chemcials actually have additives to increase the slime coat and bring the color out in your fish.
Eloise, i'm going to have to call these guys out saying they are wrong here. Make sure the ph's and temperatures are the same before you continue to transfer fish, of course you do this over time and not in one attempt to change the ph. But going from 6.4 to 7.4 can be fairly harmful. What these people fail to realize that 1 ph difference actually means that the water is over 1,000 times more acidic. it doesn't mean that it is slightly more acidic, it is WAY more acidic. a ph of 2 can burn through your skin, 2 is only 4 away from 6.4.
Guys rethink your knowledge of fish before you give false info.