I wouldn't get ANY gouramis unless you return ALL of the mollies. If you do, then get only a single dwarf... in a 10g, more than one would fight unless it was a male and a female, and female dwarfs are very hard to find and they are only a gray color. Any of the non-dwarf gouramis get too big for a 10g. A paradise fish would work INSTEAD of a gourami, but the tank would need to be very well covered... I had one jump out of a 10g, through the hole around the filter. A female betta would also work, either instead of a gourami or with a male dwarf gourami (not with a paradise fish).