For plants, you could try Glosso for the foreground, with the Downoi beside it. Downoi does best in acidic water IME, so keep that in mind. I'd use a substrate like ADA Aquasoil, since it lowers the KH
a bit. Other plants to try would be some small leaved stems like Ludwigia arcuata, Rotala rotundifolia, Baby Tears (M. umbrosum), and some smaller Cryptocorynes like parva and petchii. You could attach some Anubias nana petite to driftwood or use some moss.
For fish, I'd go wtih some micro rasboras, like Boraras maculatus and maybe some Cherry Shrimp for the bottom.