It will either have to get used to it or die.
A heater can raise the temperature of a fish tank if needed
no because if its a freshwater tank the rain has salt in it
No, it is not recommended to use bottled water in a fish tank for fish as it may lack essential minerals and nutrients needed for their health. It is better to use dechlorinated tap water or water specifically designed for aquarium use.
depends on the size of the fish, there might not be enough oxigen in a small fish tank.
The simple answer is yes.
It is not recommended to use a tank that previously housed a snake for fish. Snakes may carry diseases that can be harmful to fish, even after thorough cleaning. It's better to err on the side of caution and use a new tank for fish.
Of course you can.
No
no
math
To clean a fish tank glass, you can use a non-abrasive sponge or a special aquarium glass cleaner. Avoid using harsh chemicals or abrasive materials that can harm your fish or the tank's ecosystem.
A minimal tank size of 2.5 gallons is recommended for a single Betta fish.