What kind of food are you feeding? Have your fish began to regain some more color since the last post here? What I have found someone correct me if I'm wrong about this but foods with krill in them will help promote color in tropical fish I feed a variety of foods to my fish all with different ingredients and all my colorful fish are bright and full in color. Sometimes it can take weeks even months for these foods to have a real affect on the fishes colors. Maybe the lfs you buy from was feeding a "filler" food instead of something healthy hard to say tho.