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This depends entirely on what type of fish you mean, and what the ambient temperature of the place where the fish being kept is.
Goldfish, for example, do not need a heater. They are best kept at room temperature.
Tropical Freshwater Fish, which need 77-82F generally, will need a heater within a few days if the ambient room temperature is below about 73F. Usually tropical fish are able to tolerate somewhat cooler temperatures (70-75F) than they need for a time, but it leads to stress which eventually leads to disease. Fungal infections are common in fish kept in water which is too cold.
What else can I help you with?
How long does neon fish live?
Approximately 1day but if you have some plants on it it can live until it's life span
Do guppys need a heater?
yes guppies are hot watered fish so they need a heater and a filter also to be feed unlike an alge eater
How long do toothpick fish fish live?
a long time
How long do tiger fish live?
Where do tiger fish live
How long do bullhead fish live for?
how long does a bullhead live for
If you eat alive fish how long can it survive?
The fish can live as long as about 2 years but if yo eat alive fish the fish will live for about 2 months.
How long is a fish year?
for how long they live for
How long do river fish live for?
it depends witch fish it is
How long will fish last frozen in water?
frozen water can last forever as long as the temperature doesn't go up
How long can a fish live?
A (forgot fish) can live for atleast 80 years, if the (forgot fish) is lucky, it can live over 80 years
How long go pond snails and fish live?
Do you mean how long will they live together? As long as the fish doesn’t eat the snails, they can coexist peacefully.
Does the water need to be heated for a fighting fish?
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.
