HIDOM 100W aquarium heater
There are some fish that are perfectly happy at room temperature, such as cloud mountain minnows, but you open yourself up to much greater varieties and better overall environmental control if you use a heater to keep the temperature of the water relatively stable.
I use the HiDom 100W submersible heater. It’s very affordable and does the job well. Some things to be aware of:
- The heater has no over-temperature automatic shutoff. If you keep it plugged in while not submerged it will heat itself to destruction
- It has a temperature setting dial on the top with marked temperatures, but these are more like signposts than calibrated values. Use an actual thermometer to measure the temperature of the water and turn the heater dial up a little to make it warmer, or down a little to make it cooler.
That all being said, this heater has been really great. I destroyed one when I didn’t unplug it during a water change, but then I bought another one because other than that I’m really happy with it.
I aim to keep the water temperature at or slightly less than 25C.