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A cheaper way to increase the humidity you get from a tray is to put a regular light (I use a desk lamp with a 40W bulb) right next to the water (almost touching it). It will warm the water and cause it to evaporate faster but it won't heat up your tree too much. I do this in my dorm room because I don't really have any other options at the moment. I have a serissa that is liking it.
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