Bests & Worsts Reviews from Amazon

I wish I could give it a -5. I don’t normally write negative reviews, but I have to, since I’m so upset with how this item performed. I purchased a 50w mini heater for my 1.7 gallon aquarium that includes 1 male betta fish named Poseidon. I had set the heater to 76 F in the evening. Usually water temperature for a betta can ranger from 72 F-82 F. I went out with my sister to eat and when I came back at 9:00 pm, everything appeared okay. My betta was swimming fine and chilling in his rock as normal. At 4:00 am, I was woken up by my cat. About a minute into waking up, I noticed that my fish’s breathing was heavy and he had difficulty swimming...showing red flags of stress. while looking into the matter, I noticed the water was hot to the touch. I quickly removed the heater which read on its digital screen, 76 F. I used a thermometer to assess the actual temperature; it read 100 F. I immediately began doing about a 20% water change with cold water to try and even out the temperature, while being diligent in not stressing him any further. After 15 mins of doing the water change, he started improving and wasn’t showing any signs of stress. The user manual and what’s posted on the product’s description advised that the item is a “perfect heater” for a 0-13 gallon aquarium. I have worked with different heaters when I had my fish in a 5.5 gallon tank and NEVER went through this experience. Unfortunately, I had to downsize my fish’s tank due to down sizing my home. However, I was simply looking for a small heater that would work well for my fish’s current tank size. Also, the heater’s size is pretty bulky for what’s advertised, that it can be in tanks smaller than 6 gallons. I’m currently looking into mini 10w heaters. Luckily, my 3 yr old betta fish did not die, but I will not be purchasing from this company or seller again.