Betta fish are pretty versatile. They could be in a cold water tank (not below 70 degrees) or in a warmer tank (upper 70's lower 80's) just, don't put them in cold then suddenly warm and vice versa, or, they'll die of shock. Also, they could be in a still water bowl or in a tank with bubbles. Although a betta can survive in a small bowl, a container of at least 2 gallons is preferable (a person could live in a closet, but would he want to??). Male bettas are "fin nippers" and so if placed in a community tank, avoid fish with long fins, like mollies or guppies. You must have at least 1 gallon of water per inch of fish, and provide plenty of hiding places.
The main temperature you should keep your fish tank is at 80 degrees.
Normal tropical fish tank temperature; 77F-82F
Inside the tank as it is for you to see the water temperature.
It is used to regulate the temperature of the water
To prevent shock which could kill your fish.
The temperature of the water depends on the type of life/fish you intend to keep in the aquarium.
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
Yes it is important to have a thermometer in your fish tank. The temperature of the water should be between 75-80 degrees.
The instrument that is needed to measure the temperature of the water is called an "Aquarium Thermometer".
A heater can raise the temperature of a fish tank if needed
The water in the tank that you are transferring the angelfish to should be the same temperature and PH of the old water.If you are adding them to your tank from a fish store, then you should acclimate the fish first by floating the bags in your tank, and every so often add a bit of your tank water to the water in the bag to avoid temperature or PH shock.
the name of the salt water fish is not given. more to the pointy is that gold fish are fresh water fish- therefore salt water fish other than anteroom's or catadromos fishes would eventualy die. These fish die because the salt water is cooler than claen water. Also, it would depend on what the temperature of the tank was before you changed it.
No. The temperature variation will kill one or the other. (Too warm for cold water fish, too cold for tropical fish)