I've got 3 gouramis too (came with the tank).
Two gold (I think) and a blue one. The bigger gold gourami is chasing the smaller gold one, especially at feeding time. Then, that guy in turn goes after the blue one
I'm not sure if they're hurting each other. I can't see any ripped fins or stuff. Granted, I have other problems that I had to attend (broke a heater).
Also, the serpae tetra (got 4) will nip them once in awhile. I think I'll get 2 or 3 more of them, to make them happier. I should off get neons instead....
The gouramis are sitting under the top usually. I have almost half of the surface covered with floating plants. and some on the bottom.
Should I get rid of the bigger gourami, or just let them get used to each other. The bigger one came from a different tank when I've bought this tank from a guy off craigslist.