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No. Charcoal bits will harm your betta fish. But you can use deactivated charcoal bits
Use a syphon, a gravel vacuum, or get a crayfish because they just eat fish feces all night long.
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
The mass of a fish tank should be measured in kilograms.
depends on the size of the fish, there might not be enough oxigen in a small fish tank.
The simple answer is yes.
It depends on the size of the fish tank, the type of fish you keep, the filtration that you use on your tank, and whether you are using a bucket method, or have a gravel vacuum that attaches to a faucet
math
Of course you can.
It will either have to get used to it or die.
no