I love this heater! I have a 3.5 gallon betta and the betta can be sensitive to temperature changes. I have previously tried two other heaters from Tetra and Topfin (both more expensive I might add) and the temp swings in my tank were insane! This heater is so much better! It turns on and off frequently so the temperature stays very stable; it keeps my tank at a constant 78 degrees Fahrenheit. This heater works great and makes me and my fish happy!
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