agreed with ox, Gouramis are labrynth species so they build bubble nests. I've found some information online however about breeding this species.
Sparkling Gouramis can be bred in captivity and thriving Sparkling Gouramis can spawn monthly. It is recommended to keep a group consisting of six or more Sparkling Gouramis together and let them form their own pairs. Distinguishing males form females is difficult, especially before the breeding period. During breeding, both sexes will display enhanced colours. You can coax your Sparkling Gouramis into breeding by increasing the water temperature and lowering the water level to no more than 15 centimetres (6 inches).
When the breeding period begins, the male Sparkling Gourami will start building his bubblenest from air and saliva. In the wild, the bubblenest will be hidden under leaves at the surface, and including this type of aquarium decoration is therefore highly recommended if you want to breed Sparkling Gouramis.
The male will then start courting the female by dancing near her and wrapping himself around her. During the mating, the male Sparkling Gourami will embrace the female and their bodies will become tightly intertwined. The female releases the eggs, the male fertilizes them, and the eggs are placed inside the bubblenest. The spawning process will often be repeated several times within the same day. During each release, no more than 10-15 eggs is released, but after a day of spawning the bubblenest can be filled with more than a hundred eggs.
It is always recommended to use a separate breeding aquarium for Sparkling Gouramis, since you might have to tamper with the water level and temperature. The male will also be highly aggressive when he protects his bubble nest. Letting him stay in the breeding aquarium and returning the female to the main aquarium after spawning is therefore recommended. The male will be violent towards the female as well as towards other fish species when he is caring for his offspring.
After a few days, the eggs will hatch. The emerging fry is really small and must be feed microscopic infusoria. Remove the male when the fry is free-swimming. As the fry grow larger, you can start giving them newly hatched brine shrimp and then gradually increase the size of the brine shrimp. The water must be kept clean and frequent water change swill be necessary when you are raising Sparkling Gourami fry.
Sited from
http
/www.aquaticcommunity.com/gourami/sparkling.php
