I have a 5.5 gallon tank and a 10 gallon tank and this heater works great on both! I found the first one I got for my 5.5 gallons didn't quite reach the set temp so I had to go overboard but it still worked great. When I got my 10 gallons and went to the local pet store the owner told me to let the heater sit in the water for 30 minutes before turning it on and it worked! Thinking I might have broken the first one, I ordered a third heater. However when I did a 5.5 gallon water change I left the original heater in the water for at least 30 minutes before plugging it back in and that seemed to fix the problem! I kept the 3rd as a backup or just in case I get another tank. I also love that it's fully submersible, so if it's too high to have water and a watermark, you can have it in your pool on the corner! Overall: definitely recommend!
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