hi Miskell.a
Welcome to the forum!! you can introduce yourself to the welcome section of the site, and let us know more what youre interest are.
well, i no expert on gourami breeding but i have spawn bettas lately.
for filtration, sponge filter is good, but keep the air barely bubbling. this will not actually disturb the bubble nest and still keeps the tank cycled. some people prefer no filtration as the fry can eat the infusuria as the water go green. from what i saw from the post, are u trying to breed a A three spotted gourami with a honey gourami? if so, this wont work as they are two different types of gouramis.
but for breeding honey gouramis, Mating can usually be triggered by lowering the water level and raising the water temperature. The the male will start building nest is made at the surface among the floating plants. The male courts the female under the nest, where he curls around her and turns her belly-up. The eggs are laid and fertilized in this position. The eggs float up to the nest where the male will keep a constant watch. He will chase away all intruders including the female, as well as keeping the nest in constant repair. this is when you remove the female.
Any eggs or fry that fall from the nest will be quickly scooped up and gently spat back into the nest by the male. The eggs hatch in about twenty-five to thirty hours and the fry become free swimming in four to five days. when the fry started wonder off from the father and looking for food. this is when u remove the male. it is best to feed fry live food.
higher water temperature should be maintained for several weeks after hatching to keep fry growing.
hope this helps.
shiuh