Some conditions are necessary for the good functioning of an aquarium. The filtering, the oxygenation, the heating of water are essential functions.

The filtration
The fine particles rubbish and other suspensions that appear with the time must be removed out of the aquarium. It is the job of the filter. It watch to biologic elimination of all the noxious losses such that remain of food, dead leaves and excrements of fishes.

Without filter, the aquarium water would be a lot of particles and the ground covered with losses organics and vegetables debris.
The filter play a chemical and physical role :
- decompose of losses by the bacteria of masses filtering,
- move water created by the pump to avoid the sediment of losses.

It exists several types of filters:
- the filters under sand (ideal for the small aquariums),
- the internal filters, to 80 liters,
- the exterior filters, of 100 to 300 liters
- the ferries to decant, integred in the aquarium, for all sizes.

Nevertheless, no filter cannot replace an uniform partial water renew.

The L'oxygénation
Oxygen dissolve in water is essential to the fishes and to the plants. The oxygenation can be obtained naturally by the plants, or mechanicly by the brassage of the rejection of the pump to the surface of water, or by a pump to air who, with the help of a air vent, oxygen the water in permanence.

The temperature
Good number of tropical fishes require that the water has a temperature Constant of 25° C. The ambient temperature of a normally heated chamber (about 18 to 21° C) insufficient east to assure them the heat of their water origin. Among the numerous currently available systems on the market, the tubes heating have all particularly done their proofs. This system allies under the smaller format a resistance and a thermostat. Watch, while buying a device of this type, to what it be well in accordance with the norms in vigor. You will have thus the entire guarantee of a device technicly very good. His usage will assure the maintenance for you telling chosen temperature. The device must be immersed at least to the bottom of the valve closing and must not be put in the ground. His power must correspond to the volume of the aquarium. An aquarium of 100 liters requires a power of 100 watts. Nevertheless, some regulate general, in heated pieces normally, a report 0,5 watts a liter of water proves itself already sufficient. Before all cleaning or change water, you assure always that the electric sockets is off. The better is again to set up the thermostat (to the help ventouses) to the rear pane of your aquarium So that the lamp witness be very visible. A blow eye suffices then to realize if the desired temperature is attained or if it is necessary to intervene. The hood protection thermostat has itself situate above the surface of water and either must not be withdrawn, or damaged.

Some summarized :
* THE EMPLOYMENT of filters interiors depends of the size of the l'aquarium
* The filter has first to be wear out, so that can develop the cultures bacterial useful to the aquarium
* Evoid to proceed to the cleaning of the filter (all the 3 to 4 weeks) and to a change of the water.
* For the cleaning of the filter, not use no chemical product (only of current water to 25°C).
* Watch to what water be correctly oxygenate
* In a normally heated piece 0,5 watt per liter of water is enough