For your plant leaves , If they are yellowing they are probably just going to shrivel and drop off . No need for you to do anything really .....however if you like before they are yellow you can remove them Leaf cuttings laid on top of the soil will sprout roots and start growing , I often stick them in dryish medium .i.e. not very moist and definitely not wet and start new plants. Just let the leaf edge dry for a day or two before planting . For Mother of thousands though I don't generally do this as it makes plenty of babies along the edges of the leaves.
