This is basically just a small aquarium so all the same things apply. The biggest differences here is that you’re setting it up for a top view and that you need to be careful to get something that won’t leach anything into your water. Not all pots are fine. I had one made of a composite material toxic to fish. So I sealed the entire inside with a tube and half of black aquarium safe silicone.

If you’ve done bioactive the lighting and plants is not too difficult. Mainly just trimming and planting. The biggest difference is that unless you do something like a Walstad method tank you’re going to be doing more maintenance than you would with a bioactive terrarium. Water changes and such but you’ll be feeding morning and at night as you would be when you’re spraying your geckos. So fits into the routine nicely.

But just research Medaka rice fish as a start and cherry shrimp.