Response to Tray heater resource

I've used an aquarium heater stuck in the tray. I guess ideally you would want a pump to circulate the water around - I just used to swirl the water around with my hand. Check out agricultural supplies - some of them make tray heaters that basically look like mats which does sound perfect(e.g., http://www.ken-bar.com/gardener.html). You might want to make sure that is safe around water, though (although one would think that it should be given that plants get watered). Hope this helps. Cheers, DJ.

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