well if he is still to small then wait until he gets bigger, but you can try this if you want
To start, you will need to prepare a ten or twenty gallon tank as the breeding tank. Sprinkle a light layer of gravel on the bottom of the tank, just enough to eliminate the reflection from bouncing up off the bottom. Place a small, foam filter in the corner of the tank, do not use anything stronger then this. Provide a clump of Java moss and some duck weed for vegetation and an up turned clay pot for the female to hide in. Set the temperature between 25 degrees to 28 degrees Celsius and adjust the PH in the range of 7.6 to 6.6.
After your tank is prepared, place the female gourami in the breeding tank by herself for two weeks prior to introducing the male. If you introduce the female into the male's tank he will likely kill her in his attempt to defend his territory. Feed both the male and female gouramis brine shrimp and blood worms to ready them for breeding.
Once the female is fat and gravid, you will then be ready to introduce the male into her environment. Over the next few days, the male will attempt to build the bubblenest and entice the female to breed. Watch for the male and female to "dance" together. He will cup her body and wiggle beside her in an effort to have her release her eggs to be met by his milt. Once the fertilization has taken place, the fish break apart and the male will collect the eggs to the nest. They will repeat this sequence over the next few hours.