gouramis need to eat, eat, eat!
a trick ive learned is to: feed, and then put some more food in a bit after they finish, the gouramis may be caught off guard. also, because i have big moonlights and kissers, mine tend to naturally send the small flakes down sinking, as they move around so much
so putting some normal, and tiny flakes in together, should allow non top feeders some.
or you could just stir some flakes with your finger, that'll sink them.
really you'd have to go out of your way to overfeed tropical fish, so dont worry about it
"Atrocities are not less atrocities when they occur in laboratories and are called medical research."
George Bernard Shaw