help!!  i have a procumbens nana that i think might be dying/dead. first off, i'm a beginner.  i have a nana that i bought at a home improvement store as a ground cover plant.  i pruned it and repotted it in a soil mix of about 60% aquarium gravel (natural, but polished which i now know was a mistake) and about 40% pine bark.  i've been watering daily.  today i noticed that the fine branches and tips are dried out and snap off easily.  have i killed it?