Well I am looking to replace my hydor theo heater. I have gave up hope on using this heater with sponge filters. When I had my internal filters it was rock steady and was only off by a few degrees but since I switched to sponge filters it is very inconsistent. It seems to also let temperatures sway +/- very wildly. I move the heater one notch and it launches temps up 4 degrees and I have just became frustrated with it. I'm not sure if something is wrong with it or not. Right now my tanks are staying anywhere from 76-82*. I would really like to keep it at 79* because of the anacharis that I have in the tanks as it seems to melt above 80.
I am now going to give this http://www.petstore.com/In_Tank_Heat...EJ1111-vi.html
a try as it has the ability to be recalibrated. Has anyone else tried these or have any other input why the theo has turned into a headache for me?