As you may see around the pic when fully grown it develops this big bump on its head that together with the vibrant blue color, causes it to be so persuasive. With a good looking bulbous head and bright coloring, the Flowerhorn Cichlid is well known in exotic freshwater tanks https://pearlaquatics.my/product/proguard-pg3500-pg4500-pg5500-2-in-1-amphibious-water-pump-aquarium/