07-14-2009, 12:12 PM
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Originally Posted by xRacheLx
2 Neons died while I was floating the bag. have nay concerns?
Common “wisdom” in books and “experienced” fish keeper tell you to float the bag with your newly arrived fish to adjust the temperature; that is the worst possible solution and nonsense that has survived forever. Well-packaged fish can survive 2-3 days in a bag with no problem. The water may be cold and a bit filthy, but the metabolism of the fish is slow now because conditions in the bag have worsened only gradually and they have adapted. When you warm up the dirty water, the metabolism kicks back in and the fish get terrified due to the light and warmth. If the bag remains closed, low oxygen levels may now lead to suffocation because the fish panic and use more oxygen. In normal fish bags (non-breather) there is also an excess of carbon dioxide (CO2), which means that the pH has dropped slowly because of continuous formation of carbonic acid (CO2 + H2O = H2CO3). However, as soon as you open the bag, the CO2 escapes quickly and the pH can rush up from <6 to 7.5 >. If there is ammonium (NH4+) present, it will quickly turn into ammonia (NH3), burning the gills, fins, and skin of your fish. The higher the temperature the faster this process becomes. - Frank