I've had a preset heater in Merle's tank since I got him and I had ordered an Eheim Jager last week. I put the Jager in today and I don't think it's working. It may even be used, considering the condition the box came in...
Anyway I'm going to return the Jager and get something else. What's a good, adjustable heater for a 5.5 gallon? I don't want anything that has to be calibrated like the Jager. I'd also like one much shorter than 9 inches, if possible.
I've looked at Hydor Theos and although they have mostly good reviews, there's enough bad ones to make me not want to get one.
Any input is appreciated.