Thank you for the information! I'm not 100% positive if these plants are succulents or not, I just wanted to make sure. I've also posted on the terrarium forum to double-check.

If these are succulents, do you have any helpful tips on how to re-pot these plants?

I'm sorry for being so clueless, I'm a beginner and trying to learn the basics! The information you provided was super helpful and now I know better for having succulents in the future!

Here are close-up photos of the smaller plants in the vase:

Looks like a Sedum, something like S. stoloniferum, and some sort of Sempervivum. You can pot up both of them in an inorganic mix (something like a combo of Turface, pumice, crushed granite, coir, and perlite), but the sempervivum will do best outdoors, as they are typically hardy down to USDA zone 4-3. S. stoloniferum is also pretty hardy, but you'd want someone else to verify thats really what you have before you leave it outside for winter. both of them will like bright light to look their best.

Ben is probably right about your other plants (I don't have different suggestions).

What zone are you in? If you have outdoor location, the other 2 (if correctly ID-ed) will grow better outdoors; they could be planted in ground or in containers.

Can you get some perlite and small grit? Any of the ingredients Ben mentioned above will be good to mix for a well-draining potting medium; it would be best to combine few. Let us know if you are willing/able to get some of them.

the big plant is a kalanchoe diagremontiana marmorata

jeci,

There's no such plant as the one you cite.