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So you can make sure the fish has a suitable temperature
A heater can raise the temperature of a fish tank if needed
Yes it is important to have a thermometer in your fish tank. The temperature of the water should be between 75-80 degrees.
5000 degrees do the fish stay nice and warm. I'm just kidding. You do not boil water for your fish tank but if your wondering water boils around 220 degrees
The temperature of the water depends on the type of life/fish you intend to keep in the aquarium.
You should look to getting a heater to properly treat the fish, otherwise it may not get better
a light might be nice but its not expected for the fish to stay alive.
in their tank
Depends on the fish. You need to be more specific.
Tropical fish stay at the bottom of the tank when the water is changed.Its because fishes feel a change in water, like the temperature and pH value, due to which they get stressed, so they decide to remain in corner or at the bottom of the tank, until they feel they are comfortable.
The water temperature varies with the type of fish, but normally it should be about 75 degrees. Most aquarium heaters do a good job of keeping the temperature at this point. If your fish get sick you may want to raise the temperature to about 82 degrees.
Have them get used to the new temperature change. i did a science fair project over water temperature on the breathing rate of goldfish and i had to change the water temperature many times. Stay in the temperature range of 65-75 degrees Fahrenheit. Make sure to not mess with the fish or tap on the tank because goldfish get stressed out very easily and can die from it.