Heat waves normal?

Littlewoman01

I have an Aqueon 5 or 10 gallon heater in my 5 gallon tank, but I just noticed while it was on I saw heat waves coming off of it. I'm worried that it could be bad so I'm unplugging it for the night. Should I buy a new one, or is this normal? I've never seen it happen before and I've had tanks my whole life.
 

H Farnsworth

yup its normal. As water heats the density changes causing light to move through it differently.
 

Littlewoman01

yup its normal. As water heats the density changes causing light to move through it differently.
Thank you!
 

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