As a side note: I wouldn't put pearl or three-spot (including opaline and gold colour morphs) into anything shorter than a 4 ft tank in the long term, nor would I keep that many species/large gouramis in a tank that small for fear of territory issues in the long term and I would keep honey gouramis in larger groups as they appreciate company.
I'd go for hengeli or harlequin rasboras with that stock, and aim for at least 15, maybe going up to 25 in the longer term.