Review on Affordable 300 Watt Digital Aquarium Heater for Fish Tank by SOUTH SHORE RETAIL, LLC - Fits Tanks from 10 to 125 Gallons - Available on Amazon! by Angela Smith

I was not very happy with this purchase. The price was great but there were no instructions on how to set the temperature. I just had to play around with it a bit to figure it out. The regulator for adjusting the temperature is located at the bottom, next to the plug, which is very inconvenient. It's hard to get behind the tank. It's 2 degrees hotter than my digital thermometer, which can be frustrating with sensitive fish. The design is also large and bulky. It is really noticeable in the aquarium. I will not buy more for other tanks.