Originally Posted by bearwithfish
wow 85 huh? i am curious is the tank near direct sunlight or a heat source? a small heater should not have the ability to raise it that much.. also (just plain curiosity why bury it in the sand? i would imagine that the sensors that regulate its own on / off function would not work properly with no flow... i had a similar heater in a 1.5 gallon with no issues that is the only reason i ask...
the tetra heaters keep water at +/- 3 degrees of room temp and have an internal auto on off feature
Sorry I was incorrect. It's not a Tetra heater, it's by Hydor. Here is a link: http://www.petco.com/product/102429/...0Heater-102429
It's meant to bury under the gravel, I remember reading that in the instructions. I don't see any sensors to speak of, which may be part of the problem. Oh and no, it's not near any direct source of heat like an appliance or heating vent. In fact, it raised the tank up to about 82 degrees overnight when I have the ac in the house set to 73 degrees. During the day I usually have the AC set to about 75 or 76, so this is heating up the water closer to 8 or 9 degrees above room temp.
Do you happen to have a link to the heater you used in your 1.5 gallon tank?