A balanced diet for tropical fish like Discus, Angelfish, and Dwarf Cichlids is crucial for their health and vibrant colors. These species thrive on a variety of foods including pellets, flakes, and live or frozen foods such as brine shrimp and bloodworms. For instance, Hikari Tropical DISCUS Bio-Gold is recommended for its high protein content and ability to enhance coloration without affecting the water quality. It's important to feed small amounts frequently and remove any uneaten food to maintain a clean environment. Always research the specific needs of your fish to ensure a nutritious diet that caters to their unique requirements.