White coating on heater?

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Belk

Aquarium Advice Newbie
Joined
Sep 9, 2021
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4
I've noticed this white coating on my heater. Does anyone know what it is and if it can be harmful to my fish?
 

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It's not even 6 months old.
It's on the outside. It wouldn't come off when i tried to scrub it off a couple of days ago but noticed it flaking off today when i cleaned the tank. Crumbles when i touch the flaked off bits and won't get sucked up by the gravel vacuum.
 
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