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Corroded looking spot on heater

1187 Views 2 Replies 2 Participants Last post by  BullDog
Just replaced the heater in my 10g, and when I pulled the old one out, I noticed it has a corroded looking spot on it. It doesn't seem to scratch off easily. Is it safe to use again (this was sort of my "backup" heater)?

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mine, same brand did that when it burnt out
This one was still working when I took it out... It was just a bit over powered for the tank...
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