A pair of dwarf cichlids might be fine in there, and Dwarf/Honey/Sparkling Gouramis should be okay too.
A few notes about Gouramis:
1) Do not put multiple males in a tank...even if they are different species
2) The best ratio for Gouramis is usually 1 male and 2 females (if you can find females for sale)
3) Be cautious about Dwarf Gouramis... due to popularity they are sometimes far too inbred, harboring parasites, and/or other illnesses possibly from overstocked breeding populations.