An important parameter for aquatic life, the temperature regulates the growth
of animals and plants and exerts an influence not only on oxygen levels but also
on many other factors.
The use of a heating kit allows the water in an aquarium to be
maintained at an almost constant temperature.
Whereas mammals have a regulated and practically stable internal temperature,
that of fish and other aquarium creatures varies according to the temperature of
the water around them. They can survive only at certain temperatures and some species
are more sensitive than others to variations in this parameter.
The temperatures of fresh tropical waters, ranging from 20 to 30°C, are characterized
by less significant variations than those found in temperate regions. In some places
the shade provided by the tropical forest cools the water, while in calm water the
temperature goes up under the direct influence of the sunlight.
The mean temperature most often recommended for aquariums is 25°C, and variations
of 1 or 2° are of little consequence. Fish are even capable of withstanding even
more significant variations for brief periods (under 24 hours). On the other hand,
their metabolism (i.e. their general bodily functioning) is in danger of serious
disturbance over any longer periods, and sooner or later they may die. It must also
be noted that excessively low temperatures sometimes favor the development of certain