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My zoomed under gravel betta heater isn't cutting it anymore. Its failing to keep my tank at a steady temp. Any suggestions on a adjustable heater for a 2.5 gallon glass tank? Im guessing it will have to be 25 watt.
 

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I have Elite's 25w mini adjustable in Beast's 2.5 gal tank. It's worked wonders. I have another brand that's also a 25w adjustable that I'm using at home in a kritter keeper for Merlin right now. That is also doing well. vilmarisv is right though, make sure you have a seperate thermometer.
 

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I have a Top Fin Submersible heater (for my 5 gal) and I love it! I am going to get a few for my critter keepers which are 2 gallons.
 
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