I keep moss on the top of my pots. When the moss dries out (as in, gets HARD) I water. Place pot under tap, and run room temperature water into it until it is SATURATED. (make sure the pot in question has lots of drainage holes.) I then let it drain in the sink for about 5-10 minutes. Ours grow like weeds.
I would also be concerned about the heat. Simplest solution? Try moving them. Lots of light, but not direct sunlight. Off to the side of a well-lit room works best. Water as above, and if they're not feeling better, repot or cut all the leaves off. That's right, cut them all off. Dont' worry, if it's going to live, it'll start to grow them back within a week.
Kim
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