It depends on each type of fish. Certain tropical breeds need their own temperature and pH level. Goldfish are less fussy, however research into your breed of fish and find out what temperature it is best suited at. The usual safe temperature for tropical fish is between 22 - 28 degrees centigrade. However I think cold water fish are more flexible.
Yes they will. Most fresh water fish will do but you need to have the temperature and the ph at the right levels.
To prevent shock which could kill your fish.
They won't react at all, because fish need to be placed in room temperture water every time you change their water.
Koi are a cool temperature water fish while African cichlids need warm water. Koi will not be as happy and healthy with 80* water Koi are a cool temperature water fish while African cichlids need warm water. Koi will not be as happy and healthy with 80* water
Because the warmer the water gets the less oxygen the water contains.
Yes, if it's not done properly. You need the water to be to the proper chemical composition and temperature/pH of whatever fish you have. If not it can easily die from stress.
It depends on the fish. If its a tropical fish that is accustomed to salt water, you need salt water and you need to keep the water at a warmer than norm temperature. If its just a regular goldfish, freshwater at room temp should do just fine.
You would use a aquarium chiller to cool the water in your aquarium for certain types of fish that need cooler water then room temperature. It helps to keep the water at a constant temperature.
Fish don't always swim fast. If the fish is sick then you probably need to do a water change ASAP making sure that the replacement water is the same temperature as the old water to avoid temperature shock which can kill the fish.
Goldfish are "coldwater fish" their comfortable temperature range is 55F to 70F. The stimulus to make them breed is when the temperature rises to over 65F.A gold fish needs cold water.
It depends on the fish. tropical fish need warm water, goldfish and koi like colder temperatures. You have to know what kind of fish it is to really answer this one. Ask the people you buy the fish from what temp it needs.
Check with the people who sold you the tank and or fish; they may have some ideas. You can't put fish right into water from the tap; if you did that it probably accounts for their discomfort. You need to condition the water to remove the chlorine. Tanks also need to be at the right temperature, and adding fish to tanks that are are a different temperature from their travel bags is really a shock to them. There are various conditioners you can get. There is also a special salt (yes, salt) that you can put into fresh water tanks; the salt is calming to the fish. Naturally, you put in only the amount given in the instructions. The people at the store may recommend some medications to add if there are symptoms that you can describe to them. Don't be discouraged; new tanks need to be conditioned over time, and they need to contain some healthy bacteria that will develop over time as well.