If you are heavily planted and have good filtration, that certainly is not overstocked. I too would forget the SAE though. Maybe a few otocinclus instead. Dwarf gourami is one of my favorite fish; I keep a pair of males in a 20H. Be sure to give him some floating plants so he can build a bubble nest or he could possibly turn aggressive.
I have 2 dwarf gourami, 12+ chili rasbora, 5 cories, 4 otos, and 2 anchor cats, plus a breeding colony of RCS in a heavily planted 20H, and everyone is fine. Monthly water changes and nitrates never get above 30-40 ppm.
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