Growing Sundew in mini globe terrarium?

[Izzie]

Hi all! Hope spring is treating you well.


A local nursery recently got some teeny Droseras in. I've been wanting one for a while to help control the gnat population in my home.
From what the salesperson was able to tell me over the phone, the sundews they have are the ones with long, skinny leaves covered in tendrils- makes me think it might be a subtropical sundew? Their tags don't say anything more than "Drosera."

If that's so, do they not need as much humidity?
Living in a dry home in a dry state, I was thinking it would do best in a mini terrarium.

I have an old fashioned glass globe terrarium (I bet it would hold a 1/2 gal, has a 4" opening on the top) that's probably an antique, but is pretty substantial looking, so not afraid of damaging it.

The plants they have are in 2" pots, and are pretty tiny, would this little globe be good for them?

How would I set it up? I have peat moss and sphagnum moss available, I'm planning on buying some sand.
Would I use 2:1 peat and sand, with a moss top dressing?
Can i just sit it's pot in the terrarium, with a water reservoir in the bottom? Or could I do a layer of gravel, then the peat and moss, and do that for it to have the water on the bottom?


Sorry for all the questions, I hope you guys can help!