Terrarium fans. How many plants do I need for a 5L terrarium? What do you have in yours?

[PhilCollinsFingerWag]

I have bought a 5L terrarium, it’s due any day, and up to now I have bought four plants for it.

How many more do I need if any, and what do you have in yours?

Up to now, Ive bought a fern, which is a bit spindly, a pink polka dot plant, a spiderwort looking plant and not sure what the fourth one is.

I need a tall ish one to offset the small ones, and which will look good with the fern.

Any ideas or advice would be appreciated, thanks.💐