My own experience with stuff labeled as spring water was that it was simply water treated to remove almost all minerals using an RO process. If that is the case with the water you have been using, stop doing it. Fish need some mineral content to their water in order to properly control their internal water content (various additives call it osmotic stress). Freshwater fish urinate constantly to minimize the build up of water in their systems but nearly pure water makes the process much harder for them to maintain. If your water is truly taken from a natural spring, which is most unlikely, it will contain plenty of minerals, which may or may not be better than your local system tap water.
Chances are good that you are experiencing a bacterial bloom but that is almost meaningless to the fish. What you really need to know is the concentration of ammonia and nitrites in your water. If you cannot measure those, daily water changes of at least 50% are your only option for at least 6 weeks.
As PO stated, you need your own ammonia and nitrite test kits during a fish-in cycle like you are doing. Without that you have nothing to guide your water changes except things like my conservative estimate of 50% daily.
Chances are good that you are experiencing a bacterial bloom but that is almost meaningless to the fish. What you really need to know is the concentration of ammonia and nitrites in your water. If you cannot measure those, daily water changes of at least 50% are your only option for at least 6 weeks.
As PO stated, you need your own ammonia and nitrite test kits during a fish-in cycle like you are doing. Without that you have nothing to guide your water changes except things like my conservative estimate of 50% daily.
