Help Me

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Originally Posted by Whatigot

What?
you can definitely use them without a controller.
I have 2 and one stays on day and night and the other clicks on when my lights click off, no controller and my temp is 80-81 degrees steady as a rock since inception.

To say you need a controller is misinformation and incorrect.
FYI.

If you look at the grade of heaters in the link and the wattage you'll see they require a controller. You have 2 300-800 watt heaters in your tank that stay on with no temperature control?
You must live in a freezer.