I'm upgrading two a thirty gallon in 8 months and atm the dwarf gourami are only one month old and they are both female
Then I would wait until you upgrade to add the second dwarf. It will be horribly cramped.
Consider this: would you rather have multiple dead dwarf Gouramis before you upgrade, or just settle on one until you get a 30 gallon?
The Gouramis will continuously die in that little tank. Do you really want that?
Sparkling gouramis or elassoma Evergladei would work
The licorice gourami could work
They reach 1.5 inches in length
That's the smallest species around. I think the croaking gouramis are slightly larger
I'd recommend the sparkling gourami
I'm going to a different LFS today. So I'll see what they have.
2 female gouramis are fine together. And don't hijack . I'm pretty sure were on the topic of "fish that won't eat RCS"