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EJ may well be right that you just got a duff plant but can I offer a bit of hope? First of all, you need to change your watering regime. Giving plants a regular 'misting of the top of the soil surface so it stays moist' is really bad news. That means that water doesn't get to the roots properly and it encourages the roots to move towards the surface of the soil. Far better to give it a good watering once the soil on the top of the surface feels dry and let the pot drain well. Secondly, indoor plants tend to slow down their growth in the winter months so there is nothing unusual there. And finally, rubber plants are easy to strike from cuttings. Forget all that 'air-layering' malarkey. If the plant tip still looks healthy come April then cut off the top six inches, take off all but two leaves and the growing tip and put it in a five inch pot of compost in a warmish room. Do this carefully because the plant will leak a white liquid everywhere there is a wound but will soon 'heal'. Good luck. :)G x