Would it be a problem putting these two together? I know the barbs nip fins and I am afraid they might nip the long rope-like fins of the gourami. I am deciding on whether to put a school of Tiger Barbs, Harlequin Rasboras, or Zebra Danios in a 20g tank with 4 dwarf gourami. Which one would be the best fit? I really like the tiger barbs.