Re: Mosses dying all of a sudden
The low vs. high makes me suspect that they might be drying out, depending on the location of your vents. I have a lot of trouble growing anything up high in tanks with vents at the top, let alone mosses. It doesn't matter how much you mist if you are getting dry air moving past the area where you are having issues. I suppose you might try misting more times a day for a shorter period of time rather than a couple of longer soaks.