Re: Hydor inline on 10 gal Tank?
The other side of that advice is that bigger heaters, when they do fail, will overheat the water very badly. "Too small" heaters can fail, but will not be able to raise the water temperature high enough to do major damage. I have never read about a Hydor in-line heater failing in the "on" position, so you will probably be ok using one.
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