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How to replace heater in tank?


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I recently got a new heater to replace my old one since the new one has an adjustable temperature. 

But how can I replace it? Specifically, how can I get the suction cups to stick to the back glass with water in the tank?! I know it sounds silly, but I’m serious. I can never get them to stick well with water. 

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I don't have any problems getting them to stick underwater, but there are a couple things to watch out for.

  • The glass has to be clean.  If there's a thin layer of algae or anything similar they won't stick.  Take a razor blade scraper and clean the glass first.
  • I learned the hard way that they won't stick if I press too hard.  Just moderate pressure and they stick fine.
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