Maybe you are over-watering? What kind of soil are they potted in? How much and how often do you water? Is there a drainage hole in any of your containers? And yes, they all need good light. Your supplemental light sounds good. What part of the world are you located in? (or at least growing zone?)

EDA: I just noticed you have same thread on House plants forum -click here-. Soil you describe is water retaining - that is problem #1. Your containers do not have drainage hole - that is problem #2. These will cause problems for your plants, and should be improved ASAP.

HI Rina, i'm using a pre-mix soil which i bought from the gardener, probably a grit+potting soil+perlite if i'm not wrong. I think I will have to change it to faster draining mix.

I didn't do my research well enough before getting into it, end up I got a pot without drainage for the look. I'm now aware of good drainage is very important for cacti and succulent, but is there a way to water them in a pot without pot without drainage? (like terrarium?)

I usually water them once every two weeks but make sure the soil is completely dry, with just 2-3 table spoon of water ( was advice to do so since is a pot without drainage). But I'm not sure if this will work.

I'm located Singapore, I plant my succulent under a room with skylight but with filtered glass.

EDA: oops. I probably post it in the wrong section and didn't manage to delete the post

It's nice to have succulents in those pretty pots, but you'll end with pretty pots and sad plants. Unless you know someone who could safely drill holes in those pots, the best care for your plants will be in pots with drainage holes. Also be careful not to over-pot, in other words, small root system and large pot with lots of soil is also risky. Good luck with your plants.

Grit+potting soil+perlite sounds OK - but it all depends on proportion of each ingredient and also size of grit. If there is lots of fine soil, other 2 ingredients may not improve drainage much. I could only see the top-dressing of grit (which is OK), but that size of grit would be too big for a good mix.

Your plants will survive for a while in those pots, but in the long run it may be a problem. I would consider repotting them into containers with drainage. You need to really watch watering, and keeping plant thirsty for too long will not benefit them. You could find lots of tips how to grow succulents in terrariums and similar containers with insufficient drainage - IMO, these are quite misleading. For health of the plants (and if you want to keep them for a while) and for them to look best, that should be only temporary set-up. Socks gave some good suggestions above.

They are showing some etiolation, so filtered light is likely too weak.

Got it! I will find a way to drill a drainage hole for pots. Thank you so much!

About the soil mixing I probably go for grit+perlite+turface, is that ok for the plants? I also read about adding some bark fines, to be honest I'm a little bit confuse with the mixing. Any suggestion?

Will require a masonry drill bit. When drilling spray drill bit end with water or things will get HOT!

Hi bikerdoc, thank you so much for this! I saw those drill bits at some local hardware store. I'm going to ask for their advice of what kind of drill bits to use for different types of pots material.

don't need to. All masonry bits are the same except for diameter size. Some may be more costly depending on drill tip, but for this kind of project cheap works. I turn the pot to be drilled upside down and find center. If you're drilling a large "dish garden" type, you may want to drill 3 to 5 holes around the mid-perimeter. I drill a small pilot hole, first. If you try to drill a large hole, you risk cracking the pot or at least chipping the base. Once your pilot hole is drilled, use whatever size bit you want and drill from the bottom through. If the pot is large enough to drill from the inside, you can drill part way through and finish from the outside. This minimizes cracking around the hole. Again you must use water to cool the project.

Good info bikerdoc. I think there is a good youtube video about this as well. Can't be too careful, no injuries please!

I bought some of the hole saw bits. The diamond bits work well for me. You still need to use water. I bought the red one, a 1/2 inch hole. It worked so well that I drilled everything that didn't move. Charlie picked up a kit of a dozen different sizes for me. The silver ones are some of them.

I have also used the masonry bits. Both work well.

WJ

I use mix of only grit+perlite+turface.

You could add some small bark -I couldn't find it easily, so I am not using it. I add less turface, (no more than 20% of total volume) since it is more water retaining, but you should experiment to see what works in your climate - if very hot, you may want more retention. You probably could control temperatures indoors? The size of particles should be quite similar. I screen perlite and turface to get rid of smallest particles, and I rinse grit as there is always some dust. Here is the photo of grit - that size is quite good & I try to get same in turface and perlite:

Some ppl use mix of soil + perlite, or soil + pumice (in about equal amount or less soil) - I do not, so can't advise. You could grow succulents in just grit, or just pumice, or in many mixtures of different substrates. Depends on what you can get easily, how much effort you want to put into sourcing the stuff and mixing it, and also on your growing environment. I prefer not using any organic component like soil or bark, mix drains very well. That doesn't mean they can't be used!:).

Depending on material you use, get appropriate drill bits - what bikerdoc and Crenda pictured works very well on glazed pots, ceramic, concrete. Besides those, I also have these:

I usually insert piece of wood inside of pot to be drilled for support, so there is even less chance of pot cracking.

Don't forget to provide more light. Almost all succulents need lots of it to grow well.

Hi. Haven't read all comments so pardon if I repeat some things.

Echeverias are hungry for sun. So despite most sources saying they can't be in direct sunshine, they can be trained to be in full sun and they do beautifully there.

Trained here means they are adjusted gradually. So you can start with morning sun and increase it to full slowly.

To be honest, Echeverias, unless in big unobstructed windows, don't do well indoors. Our lighting is too weak and one-sided. So they end up not drying up well after watering and stretching.

So my advice is slowly acclimate to outdoors OR if you insist on indoors, transition it to a South exposed window for lots of light.

I think I will just use grit+perlite+turface and try out on the percentage of turface as it can get quite hot here sometimes. I've change my supplement light to T5HO 6500K, 48W, and it is on from 8am to 7pm, about 11 hours in total. Hope my plants are happy about it.

Watched a few tutorial of how to drill drainage hole as well, never handle these before but hope it will be fine :)

Thanks for the advice!