dwarf cichlid
honey gourami
corydorus
zebra plec
The list so far… but how many of each (max)
As others have advised, I would not get dwarf gourami. Also, gourami and cichlids should not be combined, they are too much alike. A pair of Apistogramma is fine.
Corydoras need a group, and you have the space so 12-15. I would have 15-20 in a tank with these dimensions. You can mix species, they all get along, at least the "normal" cories do, we are not talking the Scleromystax species here. Get around five minimum of each species, if going with mixed at 15-20.
Are you really considering the Zebra pleco?
Edit: Include the 12 cardinals and 12 rummynose, so everyone sees the entire picture.
And, you still have a void in the top half of the tank...cichlids are lower level fish too.
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