Review on 🐠 Aquarium Heater Submersible Auto Thermostat Fish Tank Water Heater with Adjustable Temperature, Suction Cups, and Protective Case by Mylivell by Karen West

I tried this heater because it's a different brand that kept breaking me. I have a 5 gallon aquarium and it slides in the back where the filter is. There are no temperature markings on it, just a knob that rotates. Basically you can tell by the red light which unfortunately is on the side and which of course is on the back of my tank where you can't see it when it's on or off! There's a knob on the top that you turn to set the temperature, but that's all just coincidence as there aren't any markings. I keep adjusting it to get it somewhere between 77 and 80, but it seems that even if I rotate it just a little, the change in one direction or the other is abrupt. I can't get it where it's supposed to be. It seems to be hanging on the low side, which is pretty annoying. Thermometer not included, had to be purchased separately. I wouldn't buy it again. I've had it for about 3 weeks now and to be honest I'm not entirely sure if it's working properly.