I agree. That's what I kept trying to tell hubby's grandma. I think that she finally got the hint when the tank was always cloudy and there would be tons of food in the gravel in one week. I also had her switch from flakes to a sinking pellets. The fish are still fat but not as bad.I would fast the tank for a day or two and switch to once a day feedings. Probably alternating the foods. Don't let them fool you, they always try to look hungry.
I thought that those were male dwarf gouramis fish-addict. I'm glad you mention that. I know at my store they only sell male dwarfs.