Chevyjaxon.... did you ever find out what caused the problem? I know this is an old thread, but I've just joined the site, am a newcomer to the hobby, and am having a similar problem.
I have a 110g tank w/sump, Rio 26H, submersed heater set at 74 degrees (in sump) and temp is sitting at 82-83degrees and this is without any lights on. So far I've only added sand and fresh water to make sure everything worked well and won't add any live rock to start the cycle until I can stabilize the first issue.
If anyone else has any suggestions, I'd appreciate them. I unplugged the heater and the two power heads yesterday just to see if I can isolate the problem. So far it has gone from 83 degrees yesterday to 80.6 as of this morning.
I thought perhaps it could be the back pressure in the Rio pump because the return outlet on the pump is 3/4" and my return (flex tube) is also 3/4" so I was told to use 1/2" connectors to get the two to join. But I've called the pet store and they have told me that even with that bottleneck the temperature could not possibly soar 9 degrees up from just the pump.
PS - All equipment is new.
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