Magdalena, I hate to be a Terrarium Nazi, but however much "drainage" typed components you have set up in a glass bowl with no drainage holes, the plant's roots is set up for rot and failure. Some really robust succulents can survive such torture, but for the more specially sensitive to water succulents such as your Pleiospilos/living stone plant, will just die due to extreme moisture trapped in the under layer of the bowl because there is no air flow. Worse, if under intense light or heat, becomes cooked - hence becoming jelly. Repotting 2 times within a few months is as good as killing the plant. Living stones have very sensitive root systems, the moment they are disturbed, your plant can go into shock for months on end before it starts trying to establish itself. Throughout the time of shock, no amount of water will do the plant good, because it just shuts down itself until it thinks danger is out of the way before it lay its new roots. So you have to be extremely careful when watering newly repotted plants. You have to understand these stone plants grow in the windy and arid conditions of south Africa, sometimes on cliffs and rocks collecting water only through morning/night moistures. They can survive the harsh/extreme cold and heat conditions for months, or years even without the rain, but the minute you put them in a moist/tropical condition such as a terranium, I'm afraid the poor plant can only go into shock and die by not being to adapt quick enough to the humidity. I do not grow Pleiospilos, but I grow Lithops and fenestraria, and they are of the same "living stone" family genus. I never water them until I see signs of wrinkles or limping, then I dripple water into the soil surrounding the plant, never on top of or have water touch the plant. I always make sure I dripple enough water to see them drain, then I know the water had touched the lower roots, that is where I pour away the excess drained water in the dish and stop watering till the next time the plant is thirsty again. They sit by on a south west facing windowsills with alot of natural light, and so far they just do their thing. These guys are very slow growers, so don't expect to see movements happen within weeks. Lastly, they are all grown in very gritty soil in long deep pots. So girtty that, there is actually no "soil" in the mix. It's 1 part each perlite, growstones, turface, grits and very little vermiculite. These plants have very long tap roots that are engineered to burrow deeper for water. My advise is ditch the peat, buy some grits/turface and mix it with your perlite. you'll be with the results. I do not personally grow with sand, but you have to make sure there is no salt in your sand (aka beach sand) - salt instantly kills succulents too, because of excessive minerals that makes it inhabitable for the roots. So my next best tip is, toss the poor fella, buy a new one and try again in some pots with drainage holes. There are a wealth of info here, and I'm sure many other fellow forumers here have some secret tip or two that they are more than willing to share with you. Happy Growing! Bernard

You could behead it, but you don't have to. Either way is OK, and original plant and new offsets will grow. You may want to behead original plant since the stem is getting longer, but if you leave it will not interfere with new growth. If I may ask: is it a glass or plastic cup/glass the plant is potted in? Does it have drainage hole(s)? Soil looks quite wet to me too, and not quite enough free draining. Excess leaf drop could be from too much water. Old leaves eventually dry up and fall off, it just shouldn't be too many at the same time.

They can last outside of the soil easily for a month as long as they’re out of any direct sun. The direct sun could fry them. I’ve had succulents sit in my garage for months because of laziness🙂. I’m not saying to do this, but don’t worry if they’re out of the soil for a week. I heard a story, I think it was ASU or some University in a hot location. Someone put a big barrel cactus in a dark closet for five yrs and after those five yrs planted it in the ground. The cactus lived! Succulents have a lot of reserves, so they can go awhile without water or nutrients. Please nobody put there cactus in closets🌵.

Normal potting mix for a succulent generally retains too much moisture, and 50% coarse sand helps but probably does not tip the balance. If you do not want to hassle with creating your own mix from scratch, I would change the soil to 50% commercial "cactus mix" and 50% perlite. I prefer pumice to perlite since it is heavier and does not float. Since you have your own greenhouse, I am wondering do you have a lot of succulents, and are most of those in the same soil and thriving? Is there any chance the greenhouse becomes extremely humid or hot?