Aparlato, since this condition is occurring to all your plants, the blame cannot fall on something about the individual plants. So.....it has to be something you are doing to the plants...overall. I must ask a question: Are you on a well, and do you have a water-softening agent ---such as salt to make your water less hard? That in itself could be the reason why your plants are suffering. The salt build-up would take time to act on the plants....but seeing as how all your complaints are happening at the same time, I suspect its something that can come about because of something that is being done to all of them.....such as watering them. If this might be the case; I suggest you do a thorough leaching. Sinks, bathtub and such... since these faucets would hardly be OFF the system, you would have to find a tap that is not. Or, gather rain-water---or snow....and melt this. Let the water gain room temperature....then fill a tub or large pot with sufficient water to allow you to immerse the pots entirely in the water. Allow the bubbles to cease. This serves two purposes: It puts water entirely throughout the soil and if there are any bugs in the soil, they would have to come to the surface to breathe. There, you dispose of them. It is also a very good way to thoroughly rid the soil of harmful salts---either from too much fertilizer...or possibly as I suggest...as on a water-softening system. Treat this as a watering. Allow full drainage and put your plants in their respective sun. If you feel it is necessary, you might decide to change the soil instead. A fresh potting soil with lots of vermiculite. Just be sure to not use such softened water from any of the taps on the system. Usually a home will allow a tap or two to be OFF the system....for watering the lawns, washing the car...etc This could be thought of....gather water there and hold for plant use. If you are not on a water-softening system, such a happening to many plants at the same time I suspect still you are overwatering---perhaps you water as per schedule...and not according to how the plants need watering Your plants....succulents, hold water in their leaves as a resevoir and can take dry periods for a time. As long as they aren't allowed to go completely dry, they should be able to withstand some dryness without being badly affected. You might, when the first sign of limp....or wilt occurs, give your plants a thorough watering.....to the drainage point. Then dump the excess...never leave your plants sitting in such drainage for any extended time. Then allow them to dry down a bit between watering.....then water to drainage.

It is suffering from too much water. Soil is very peaty - retains too much water. Drainage is most likely not sufficient since the pot is inside of a deep glass container without drainage. Stem of your plant looks like it started to rot. It may be best to cut it above the brown part; let the cutting sit on some newspaper to dry (callus). Cutting should be potted in a gritty-gravely type of medium. It needs to be in container with drainage hole (don't use any glass or similar, get a saucer). It also will need good light.

Hey So I am meant to water this succulent twice a week And it needs at least four hours of sunlight per week - according to where I got it Now, I forgot to water it on the designated second day, and two days later (today) it looks like this (this image was taken by my phone, hence the odd colouring) It was kept in a shady region, but minor sunlight was available from a nearby window. Is there ANY way at all I can save my succulent? Help of any sort would be greatly appreciated - this is the first plant I'm caring for myself and I am completely taken aback. I have no idea what's happening or why it's happening. Thank you so much

Your plant probably needs more light. Transition into at least morning light afternoon shade. Possibly too wet and in a soil which holds too much water, probably needs a repot with a faster draining soil. Get commercial cactus/succulent mix and combine 50/50 with perlite or pumice and repot. This is a succulent--succulent means juicy--it hold water in leaves and stem, so if the soil is too wet, the plant rots. Cannot tell about the pot, probably clay or plastic with hole in the bottom, right? If you repot, don't use a bigger pot and don't pot your plant low. My 2 cents!