Not to be rude, but I think you are misunderstanding here. The Kissers will need a massive tank and are not acceptable in a 10gal even if they are small now.
Also, I am not sure if you have dwarf gouramis or blue gouramis, but if these are blue (3 spot) gouramis, they should really have a bigger tank as well.
If I were you I would get a 2.5-6 gallon for the betta and if you want to keep the kissers, go out and get at least a 75gal. If you can take the kissers back, that would probably be best.
If the gouramis are dwarfs, they may be OK in a 10gal by themselves, but if they are 3 spots, I would get them in at least a 30gal.