Some aquarists use coal gas as a fuel for heating, but as many houses using this type of fuel have a slot meter control, you have to be careful in case the gas supply runs out.
The maintenance of temperature in the methods we have mentioned will, to some extent, be affected by room temperature. The warmer the room, the less additional heat will be required. If you have a thermostatically controlled tank, outside temperature influences will automatically be balanced, but an electric light lamp used without a thermostat requires different wattage bulbs for winter and summer.
There is a cheaper way than supplying electricity to individual tanks. The important question here is whether you can find the space, and want to breed in quantity. If you do, a fish house is the answer. This is cheaper than supplying electricity to individual tanks, all you need is a greenhouse suitably laid out with racks for the tanks, and you can use the boiler system or the electrical unit to maintain the correct temperature.
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Whatever method of heating is used, its purpose is to maintain a reasonably constant temperature range consistent with the requirement of the fish.
It must be realized that the temperature of the water in an aquarium is not the same throughout; this is because heat rises. The lower regions of the tank will be cooler than just below the surface, quite a few degrees cooler in fact. Fish in natural waters are also subjected to these conditions, therefore it is not unnatural to them.
To obtain average temperature readings, the thermometer bulb should be positioned midway between the surface and the bottom.