Id only suggest adding some corydoras. With an endler and some neons, a group of smaller species like pandas, weitzmani, or such OR one of the dwarf species. Do 6 of one kind. Keep a species that stays under 2.5 inches. If you go dwarf species, get 10.
Or
Get 6 kuhli loaches and call it a day.
These all have very light bioloads
Or
Get 6 kuhli loaches and call it a day.
These all have very light bioloads