When installing your new aquarium heater it's best to leave the new heater sitting in the aquarium for about 5 minutes in order to acclimatise to the current water temperature before plugging in.

Whilst Aqua One Glass Heaters are ultra reliable, with many tens of thousands in circulation, we still can't stress enough the importance of keeping a spare. Your aquarium inhabitants will start to suffer from temperature change far quicker than poor water quality and having a spare heater on hand will avoid unnecessary suffering and discomfort to your precious livestock