This is my second time I got this from my friend and it is doing the same thing after few a months... The skin turns brown and then the whole plant is brown and rotten and dies. -I mixed sand in potting soil in pot. -I water very little after a week or two. -It gets partial sun for about 4hrs. -It stays at 22c / 51humid
It doesn't sound like anywhere enough sun for it. How does your situation in that regard compare to your friend's plant?
The question was, how does your location compare to your friend's location. Do they get the same amount of sun? Are you giving yours more water than your friend is giving his/her plant? Also, are these cuttings from your friend's plant, or did you friend start with a plant just like yours?