Colisa lalia vs betta imbelliis - not at all. I've got problems earlier when betta was in shrimp set (8gallon) with smaller fish, but now sometimes they poke each other and there is peace for long time

Dwarf Gourami is really peaceful fish, no issues between themselves.
I use scientific names because I don't know those names in english - I could write names in polish but then U would have a problem ];-> For example (translations polish words to english):
Colisa lalia -
Prętnik Karłowaty (midget stake)
Betta imbellis - Bojownik Karłowaty (midget warrior)
Etroplus maculatus - Żółtaczek Indyjski (yellow indian)
Paracheirodon innesi - Neon Innesa (?)
Corydorus paleatus - Kirysek Spiżowy (bronze something ?)
Hyphessobrycon pulchripinnis - Bystrzyk pięknopłetwy (beauty-fin scintillating ?)
It has no sense so I use scientific names