| Fish are cold-blooded, meaning the temperature of | | | | for more adequate heat exchange over partially |
| their body is the same of that of their environment. | | | | submerged heaters. Places of high circulation are best |
| Since fish can't change their body temperature it is | | | | for these heaters in such places as near a filtration |
| up to the aquarist to maintain proper aquarium | | | | system or pump. |
| temperature. | | | | Heating Cable Heaters - Heating cables are mostly |
| All fish are different in the temperatures that they | | | | used in freshwater aquariums but can be found in |
| are used to, it will depend on where they are from. | | | | saltwater aquariums. The heating cable is placed |
| If the water temperature changes by only a few | | | | under the aquariums substrate. Unfortunately it is a |
| degrees this can be lethal for your fish. Keeping your | | | | bit difficult to replace the unit because the substrate |
| fish happy requires you to know what temperatures | | | | must be dug up to replace the cable. |
| your fish are used to. Temperate fish will probably | | | | It is good practice to equip your tank with an extra |
| not need a heater as they are from cooler regions of | | | | thermometer other than the heaters thermostat to |
| the world. Most fish are tropical though and need | | | | make sure that your heater isn't malfunctioning. Try |
| warmer waters to survive. These fish tanks will need | | | | to avoid thermometers made with metal or mercury. |
| a heater. | | | | LCD strip thermometers are reliable and inexpensive. |
| If you are looking for a heater you have a couple | | | | Larger tanks might need two thermometers for both |
| options. They can be categorized into three sections. | | | | ends of the tank. They will make sure that the whole |
| Hanging Tank Heaters - The simplest heaters are the | | | | tank is of equal temperature. |
| ones that hang on the edge of your tank and are | | | | Keeping your tank at the best temperature is |
| partially submerged in the water. | | | | essential for your fishes survival. |
| Submersible Heaters - Fully submersed heaters allow | | | | |