Feeding your fish a well-balanced nutritious diet is very important to ensure that your pet achieve healthy growth and to bring out their best coloration. A balanced diet should consist of proteins, fats and oils, carbohydrates including vitamins, minerals and trace elements in the right formulation. However, the idea of right mix will vary considerably and that largely depends on the age and physical condition of different types of aquarium fish.
Certain species like arowana and oscar prefer meaty requirements in their diet while others are less picky when it comes to food and will generally accept anything that you feed to them. Providing wrong diet can be disastrous in the long run because the fish will end up malnourished and that could even cause them to be susceptible to aquarium fish disease.

Today there are even different aquarium fish supplement specially formulated for certain requirements. These special foods are made with high protein used as growth enhancers especially for fish fry, extra vitamins and minerals to bring out special bright fish coloration, oils formula for growth of goldfish wen (headgrowth) and there are even medicated well-balanced nutrition for sick fish.