This information can help you in selecting the right mix of fish and providing the appropriate environment. Please remember that each fish is unique, and the following is just general information.
Flake food refers to a kind of food that is most commonly eaten by both marine as well as tropical freshwater fish. This is ideally suited for top dwellers and mid-water fish. Once the flake food has settled down, it can be eaten by the bottom dwellers too. If your aquarium consists of bottom dwellers mainly, it would be a good idea to pre-soak the flake food so that it will sink to the bottom as soon as it is introduced into the water.
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Flake foods have evolved over the years and come much closer to providing for all your fish's nutrient needs. They are an excellent source of various minerals too. They are easy to keep and have fairly long shelf lives. They come in various flavors. You can even get different kinds of flakes in one can. This is a great way to feed wholesome food to the fish. Drop a pinch or two of the flake into the water and observe the rate at which this is eaten. Then you can decide how much needs to be put in the next feeding.
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For vegetarian fish, there are vegetarian flakes available, such as algae flakes. One serving of algae per day is enjoyed by almost all fish except for predatory fish. For the bottom feeders, you probably should go in for algae wafers and discs. If a disc has not been eaten within 24 hours, it has to be removed otherwise it will start putrefying in your aquarium, and releasing toxins.