I didn't think a DG could even fit in a 1g jar tbh! That's cool man, especially that they spawned in it as well.
On a side note what would you say about sparkling gouramis/s in it? I saw a lonely one at my LFS today...
I think if you were to stock a fish, it would be a smaller gourami, Betta or even maybe pygmy corydora(2-3)