Which plants are best for a closed terrarium?

[Whatsthatspookynoise]

I'm trying to make my partner a terrarium that's closed. I see some people say succulents are good and then others say they are not. I didn't realise how confusing this would be!

Any tips or info I should know?
Thanks

Please don’t plant succulents - they need a dry atmosphere and lots of light, so the opposite of terrarium conditions. Look for small creeping plants that like humidity, such as Pileas, Peperomia, Fittonia, Selaginella (club moss) and creeping fig (Ficus pumila, there is a nice variegated form) and small leaved Begonias. There are more, but depends on what is available in a garden centre.

Thank you!
Would it be okay to plant succulents if it didn't have a lid on it? So it's like a bowl.

I wouldn’t @Whatsthatspookynoise , they grow in very dry habitats, and need plenty of air (I grow many cacti and succulents in two large greenhouses), so being enclosed in a glass bowl would probably mean a slow death! They also need a very well drained potting mix, which is difficult to provide in an enclosed container.

Some ideas here for combinations.

I started a closed terrarium in a bell jar last October, so early days yet. I've got a fittonia, an eyelash fern (called Billy) and a plant called string of turtles (peperomia prostrata) which is a.trailing/climbing plant. It's early days yet but none of them have died so far. I think the SoT will need to be kept trimmed. I bought Billy because he was inexpensive and attractive and that kicked the whole project off. I bought the Fittonia quite cheaply from a garden centre. After googling 'small plants for a closed terrarium', I got the SoT as a gift. I wanted plants that not only start small but stay small. The SoT is growing faster than I thought so will require trimming but as the leaves are small that's not a problem. I might root the cuttings. Really enjoying it and looking forward to seeing how it develops.

I got a big gin glass for Christmas and might turn that into an open terrarium.

I have a terrarium with 6 different kinds of Fittonia with different variegated leaf patterns in white, pink and different shades of green.
I find their different leaf patterns and colours hard to resist, there's just something about the way the pink or white veins stand out against the green of the leaves that I find beguiling. Don't know how many I've impulse bought at garden centres over the decades, only to watch them curl up and die in winter when the combination of low humidity (very cold climate) and central heating outweighed all my attempts to mist them regularly, stand them on damp pebbles etc etc.
I wish I'd known earlier that the secret to keeping them happy was to grow them inside a terrarium. Now my only job is to water them once a month, and chop them back when the jungle starts to get out of control.