This short video shows in a clear visual manner why you should ALWAYS turn OFF your aquarium heater while doing water changes and or maintainence.
"This is a video of a Eheim Jager aquarium heater and a cheaper aquarium heater.
These heaters are both on and heating up out of water, they are then dropped in to cold water.
See the difference quality glass can make to an aquarium heater."
http://www.youtube.com/watch?v=dbDFbcd8kA0
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"This is a video of a Eheim Jager aquarium heater and a cheaper aquarium heater.
These heaters are both on and heating up out of water, they are then dropped in to cold water.
See the difference quality glass can make to an aquarium heater."
http://www.youtube.com/watch?v=dbDFbcd8kA0
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