I have had a Pachira now for about 18 months and for the longest time it was very healthy. Over the last 3 months however, things have changed, two of the stalks have browned and lost all their limbs, it has almost gone all the way down on both. A third is also starting to die. The strange thing is that condition in my office have not changed and several small very healthy stems are growng from the base of my plant. Initially, I though these smaller ones might be hogging all the nutrients, so i removed all but one. It continues to grow, along with two more tiny ones, and all appear healthy, however, my tree now appears very sicky and looks to still be dying on top. Anyone evr hear of this happening?