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Old 09-09-2021, 06:22 AM   #1
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White coating on heater?
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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Old 09-09-2021, 06:43 AM   #2
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How old is the heater?

Is it on the outside of the heater or inside it? Limescale deposit? Condensation?
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Old 09-09-2021, 06:55 AM   #3
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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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Old 09-09-2021, 07:27 AM   #4
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Looks like limescale to me. I found this thread on limescale build up on heaters.

https://www.aquariumadvice.com/forum...er-295718.html
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