fighting fish can be in temp. 70 - 80 no higher or lower and use tap water do not use bottle water fish live longer with tap water I had made that mistake by using bottle water fish did not live to long tap water fish lived over two years also if your home is warm you don't need to have a heater room temp. is fine for fighting fish If you live in a tropical, warm place like Singapore or Jakarta then no heating is needed! If you live somewhere colder then try buying a heater. Don't buy an oxygenator though it's a waste of money since they don't take air from the water but from air.
My Bettas can live in either warm or cold water but recently I noticed that when I put a flat heater in the tank he would stay snugged against it.
A Siamese fighting fish/betta? Yes! They cannot survive in salt water.
They are sub tropical in their requirements and do not do well below 60F. If there is a chance of their water going below this their water should be heated.
No Gold fish like water around 65F Siamese fighters need around 75F. They are totally incompatible.
Yes.
You need to use an aquarium water conditioner such as Prime or Amquel, although there are a variety of different manufacturers.
it will depend on its size (the total litre capacity), how many fish there are, and wether it is a cold water or heated aquarium.
They need a 5+ Gallon tank and you can only have one in the same tank.
most of the time but with betta fish no they can live at room tepature
No. Distilled water is completely devoid of the essential minerals fish need for long term health. That's what the distilling process does, it makes the water pure. Mains tap water is usually perfectly fine for fish provided it's got dechlorinator in it (to remove harmful chlorine/chloramine and heavy metals). Also, they're called Siamese Fighting Fish, not Japanese, they originate from Thailand, old Siam, not Japan! But it's more professional to call them Bettas!
because fish need it to breathe. just like humans need air to breate. to fish, water is air.
Saltwater fish require salt water, and fresh water fish need fresh water, you can't mix them, or the fish will die. You need to look at each individual fishes needs as to what temp they need their water to be. There are some saltwater fish that can survive in fresh water, but it is not healthy for them.
Depends on the fish.