A 10 gallon is the absolute minimum for a single dwarf gourami. If you want to keep more than one, then you should look at smallest species - sparkling, licorice and honey.
I would look at getting a group of ember tetras - right size for a 10 gallon - to go with some sparkling gouramis.
^^ I agree: The licorice looks like a Betta to me
(yes I do know the 2 are related).