1 single betta, or a dozen dwarf shrimp
Anubias nana petite, small crypts, exotic mosses (peacock, xmas, taiwan), small java fern
Eco-complete substrate, or one of your choosing.
3 MTS, 2 nerite snails, 1 oto
This setup would be fine with stock lighting and require low maintenance.
for reference, i have (2) 4 gallon aqueons situated side by side.
"I am Groot", the faithful protector