The Fluval submersible heaters are awesome! We use a M200 in our 55 gal aquarium and couldn't be happier with it. It has an easy to read adjustable dial to set your temperature. LED indicator to show when it is currently on and heating. We pair ours with the Inkbird-ITC-308 so we always can know what temperature our tank is running at and have a worry free system that will notify us if the tank starts getting too hot or too cold.
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