Hi. You might try rearranging the decorations in your tank as this sometimes diverts their attention. The new surroundings get them exploring around and sort of force the territorial ones to reestablish their territories. How big is your tank? If it is on the small side, some fish can get more territorial in small tanks when they start to get on the crowded side. That is something else to remember. Other than that, just watch to make sure that the gourami doesn't get picked on too much or start to get fin/ scale damage because they are prone to bacterial infection and can get sick and die from it. I lost one that way one time and it's kind of a shame because they are nice fish. Hopefully over time they will learn to get along. Just make sure it doesn't get out of hand. Good luck.