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Just added a second 250w heater to my 55 gallon.. one at opposite ends of tank. Both are set at 76,but the temperature on thermometer seems to be going past 76..does one heater need to be set at lower temp. I don't wanna fry my fish
The set points are almost meaningless - it sounds like the second heater is resulting in a slightly higher temperature regardless of 'set point'. I'd tweak the setting down a little at a time until you get back to the desired temperature - you might even unplug it and let the other heater maintain the temperature back at the desired level, then plug the 'new' heater in and turn the adjuster until the heater just comes on (then maybe back off until it just goes off. Getting two heaters in sync can be a trick - one or the other is almost always somewhat the dominant heater.
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+1 Even heaters that you can "calibrate", like the Eheims, are a pain to get synchronized. If you get them within a degree or two of each other you should be fine. The fish can move toward the "warmer" end of the tank if they prefer and the extra heater is there just in case the tank temp gets too out-of-line for a single heater to maintain. In the winter, my 55g has two heaters that are usually both cycling on/off at night, but I keep the house at 68F and my tank's room temp drops as low as 65F sometimes. Just make sure both heaters are in an area with water movement (like a filter intake/outflow) and it's good.
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