How long have you had the gourami? It took about 3 weeks for my dwarf to learn what feeding time meant, and then he would eat from the top right along with my danios and tetras. I put in sinking wafers for my Cory cats, and I never knew my gourami to eat them, but every fish is different.
50g + 10g = The start of an addiction!
keeping is a family affair!