Scratch that, I'm wrong, I double checked and was confused, apparently from what I can see online they are NOT compatible, thats just using compatibility charts though, I have no personal experience with either species, so maybe someone who keeps one or the other (or even both) will pipe in to help you out.
well its actually a 40 gallon breeder tank. Unfortunately I already have the congo tetras in the quarantine tank for now. I didnt even think about the possibility that the gourami might not get along with them, until right now, because my gourami has not shown any aggression to the other fish in the tank, but they are smaller fish, a few neon tetras and rummy nose tetras. I did have my kribensis cichlid in the tank but took her out because she bullied the gourami and I was afraid she would kill the gourami. So maybe my gourami is just not that aggressive, hopefully itll work out. thanks for your responses.