Is something weong with my rubber tree? Bottom leaves were turning yellow and falling off so I repotted (photos show before and after). The shorter one is thriving and sheath is red, but my taller one (black pot) seems stunted. The top stem is a lot lighter than rest of stem and the sheath hasn’t developed at all in 4 weeks or so and stays green. I just switched pots on Saturday… should it recover or do I need to do something different?