Hi Sandamarly
I think what you are seeing is typical gourami behavior.
Contrary to what many people think, gouramis are often sedate fish, tending on the shy side. And, they are territorial. In a large tank, such as yours, they will find their favorite spot and stay there almost all of the time.
I recently turned my 55 gallon into a community tank again, and put my gouramis in there. There are 2 adult female pearls, a pair of adult blues and 9 young blues (about half grown.) The 4 adults stay in a group, near the top, on the left side of the tank while the youngsters swim everywhere. Every now and then the blue male lunges at the female blue and she swims away--about 3 to 5 inches away! That is the extent of their activity these days.
In the 20 gallon, where they were, the male was more protective of his space and he would chase his mate across the tank and into the plants.
I don't think there are any fish in your tank that they could be afraid of. If they are in good health, don't worry.
Are your gouramis male, female, or one of each?