AlfaBetta

Product/Service: Hydor Mini 7.5W heater

Description: Small flat rubber heater for 2-5 gallon aquariums/bowls.

Pros: Flat, compact, and flexible rubber. Fully submersible even under gravel, black color, cheap, does not overheat when out of water.

Cons: No temperature control so it needs to be unplugged during hot weather.

Shastam

I wish I had read this before buying one. I hate this heater. My room is always hot, so I have to unplug it most of the time, so its not even worth having. It doesn't even keep the tank warm enough! I wish I knew of a better small tank heater.