I believe that you should cycle with some white clouds, then add some peaceful small barbs, followed by some rasporas, followed by some cories, followed by 1 male gourami or a pair (male/female) gouramis (though sometimes even they don't get along so be careful) but I could be partial seeing as my 20 gallon will eventually have 5 gold barbs, 6 rasporas, 3 cories and 1 male dwarf gourami. but I think the set up sounds good.