Where do you have the jade plant? If you have mold growing on it, it may be that you have too much humidity or you are watering it too much. Jades like medium to high light and should be allowed to dry between waterings. Avoid overwatering. If the plant is weak or leggy, it needs more light. The leaf margins take on a reddish tinge when the plant is getting the ideal amount of light.

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Terry

May the force be with you