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Originally Posted by EvilTwin
I figured the size and additional volume probably made the tank cool faster.
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This is a common misconception. Water is one of the most stable elements known to man. It actually can reatain its temperature better then most other stuff. The more volume of water that you have the more stable and the slower a change in temperature will occur. You HEX tank had a lower total volume hence the higher temperature it ran at (due to the heat from you lighting and other equipment) I can almost gaurantee that it also ran colder than your current tank. The Temperature swing will be greater in a tank with lower volume of water then one with a higher volume.