Do you find that in your experience with dwarf gouramis, they don't tend to really eat flakes? I read in a bunch of places that they would accept floating flakes, and it seems correct except my gouramis tend to stay close to the bottom of the tank most of the time, or at least in enough vegetation where they don't even see the flakes before they get eaten by something else. I've been feeding them Bio-Bled tropical fish food that sinks and they've been eating that, but just wondering about your experiences.
Although fish eat flakes, i wouldn't go as far as saying they 'like' them, try giving it a varied diet of live/frozen foods, floating pallets and maybe a small amount of flakes and that will hopefully get your gourami to become a bit more active at feeding time