What do you think could be going on? Both of my torches are not fully opening. Everything else in the tank is doing great except for these two. When I got home till now (3 hours) they still look the same.
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Both have been in my tank for about two weeks.Have you tried moving them? How long have they been in the tank.
I was originally going off the one that is goes to the controller for my heater. Before I corrected it it was saying 78 when it was really 74. So I agree with you. HahaI have no less than 8 random thermometers lying around the house. I don't know why it seems so difficult to get temperature correct but I have found that my Helio PTC therm (the important one at least), Hanna therm, and a cheapo laser surface thermometer are my most accurate. All of the cheapo aquarium thermometers from big box stores were low by at least 4 degrees. Kinda nuts.

