Originally Posted by
Cranberry
http:///forum/post/3097857
With the build up of CO2 in the bags from an overnight trip, the pH is lowered. A low pH minimizes the effect of ammonia on the fish which occurs in transport water as a result of fish metabolism, besides other things. When you open that bag, the CO2 escapes, the pH rises and the ammonia which was non toxic now becomes toxic. There's going to be a drastic change in pH no matter which way you look at it. When you open that bag it's going to bolt up. So if I leave him in the bag to drip, they have to go through a pH spike AND ammonia exposure. In my QT he'll just have the pH chage to deal with. I always know the salinity of the fish. I usually know the salinity of the fish I receive so it's all ready before hand. But a lot of people actually freshwater dip a new acquisition.... you can't exactly acclimate a fish to a FW dip.
EDIT: Did I answer the question? I float the closed bag in the QT tank. Then open it up and put the fish in the QT. Take a sample of water from the LFS to test their salinity before opening the bag so you can adjust it (don't ask, trust only your own reading). If you are buying online you have no choice but to trust them... but ask anyways. Test the salinity of the shipping water and notify the site if they were off. Enough people call them on wrong values and they soon start checking "for real".
+1 this is my thinking as well...
Like I said JMO, and as Cranberry stated there's more than one way to do things...