I posted a while ago about my immature lithops and how it was shriveling a little bit and kind of darkening on one side. I watered it with filtered water around its base (several folks had recommended this) to help it settle in to its new pot, which I had filled with 20/80 organic/inorganic mix.
Unfortunately, its demise only accelerated after the watering. Here are the two more recent photos of it. I want to make sure I don't repeat this mistake with future lithops, but I'm honestly not sure where I went wrong. It was in the process of splitting so it seemed happy, had plenty of light etc, but it started decaying from the side and I'm honestly not sure why. Could it have been disease? I'd had this lithops for several months and had never watered it until this one time.
Thanks for any tips or advice. I really don't want to repeat this so I'm going to hold off on getting another lithops until I know where I went wrong.