Temperature Fluctuations

If the tank is getting too cool, you may need a larger heater or you may have to move the tank to a location with a stable temperature. Choose a heater that provides 5 watts or more per gallon. Keep the tank away from floor registers and outside doors. If the aquarium is too warm, the most likely culprits are the lighting system, heat shedding from the water pump, or sunlight from a nearby window. You can fix the latter problem with shades or draperies, or by relocating the tank. In the other cases, you may need a chiller. Warm water loses the capacity to hold enough oxygen for the needs of the tank inhabitants. Small aquarium chillers, though unfortunately expensive, are widely available. They are usually simple to install somewhere in the water-return line. Tank water merely passes through the chiller's heat exchanger, where it is cooled to a preset temperature. Usually only a few degrees of cooling are required to offset heat gain from equipment. The chiller operates like a refrigerator, and must have ventilation around the radiator coils. Greatest efficiency comes from forced air ventilation that carries heat outside the building.

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