No disrespect to the other posters- but no. It is absolutely NOT ok to house a pair of Kribs in there. Put ONE Kribensis. Either male or female. As soon as Kribs breed, they will take control of the entire tank and murder everything. Gouramis- especially dwarves, heal very poorly from skin damage, such as bites.
If you really want to breed Kribs in there, only keep them with something they will not consider a threat, like really tiny tetras or Danios. You don't have to listen to me, but the gouramis will probably agree once they have 3 scales left.