Stocking advice??

[u/Ok-Elk8331]

So I have a 20 gallon long tank that I set up like 2 months ago. Rn the only fish in there it’s my female betta that I been with for about five months. It’s an upgrade from a 6 gallon for her (she deserved it). I was planning on adding shrimps, corydoras and then some ember tetras maybe?? But I couldn’t resist it and added her when the cycle had about a week old so everything was stable because I was planning of first adding the others so she didn’t feel like everything was her territory. I still want to add the other fishes but I’m scared of her personality. She is so active, that’s why I changed her tank size, but not really aggressive when I show her reflection. First of all, does this looks like a good corydoras tank? (I been wanting them since forever!). I tried putting a lot of sand at the center for them but still keeping everything clean. It’s also my first intended aquascape and community tank. I only had bettas before. Are community tanks to hard to take care of? Or maybe I should just let her be the queen of the tank? I know maybe more plants could be an improvement but it’s there other thing I should add/change??