mine do that sometimes, they get all nice then stop the green tip and just dry out. since yours is mounted, the humidity in the air must not be high enough. dont mistake that with keeping the spagh wet. moist medium and moist air are different things. im noone to speak but maybe a humidifier or something like that will work. dont use humidity trays. they dont work i guess and unless their in an enclosed area like an aquarium, they make little to no difference in humidity :/
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