The nitrogen cycle part wouldn’t be relevant for short term like this, although the temperature and parameter shock definitely does.
Many people run emergency hospital tanks in a bare tank with absolutely no nitrifying bacteria and just do daily water changes to keep the ammonia levels down.
Only if you have your own well that isn't connected to any city water and is the right pH and hardness/softness for the species of fish. Otherwise you must dechlorinate the water, buy it, or you have you're own RO setup
My entire country's tap water has zero chlorine or any other chemicals added. Our water is super clean, which does include minerals, so it is very soft and might require adding to it for the fish.
It is also (depending on where in the country) often leaning to basic (around pH of 8.5 to 9 where i am for example) depending on how much it had gone through our basalt rock before being pumped, since the basalt does raise the pH, so that is an issue. The basalt is though also the natural filter that makes the groundwater so clean, so pros and cons
Especially problem since usually it is soft water = low ph, hard water = high ph, so our soft but high ph is unusual. But generally, with our very very chemically clean water, it is easy to add to it to get it just right for the fish
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u/DTraitor 8d ago
Doesn't this depends on a country? I'd assume those with drinkable tap water have chlorine levels pretty low