I was looking to get a Dwarf Gourami (or two) for my 25gal community tank; Neon Tetras(8), Lyretail Mollies(4), Alibino Cories (4) and Pristella Tetras (6).
I plugged your setup into http://aqadvisor.com (I find that to be a very useful site) and it looks like you would be overstocking if you add the Dwarf Gourami's -
Other than offering that bit of unsolicited advice, I am also considering two Dwarf Gourami's for my tank soon. I have not found any particular information concerning single or paired though.