How to Feed a Fish? - Proper Feed Guideline for Aquarium Fishes

• Buy the type of fish food that is suitable for the fish you bought. Do some research and find out if your fish is an herbivore, a carnivore, or an omnivore. Most fish can be fed flake food or pellets, but some species have specialized diets. You may want to buy several types of food.
  
• Feed in small portions, only as much as your fish can eat in 2 or 3 minutes. If you put too much food in the tank, scoop it out with a fine net.
  
• Spread out the food so everyone gets some.

• Several times a week, give your fish frozen, freeze-dried, or live foods, such as bloodworms, tubifex worms,daphnia, and brine shrimp. This will improve their overall health and color.

• You can also supplement their diet with vegetables! Carrots, zucchini, cucumbers, carrots, lettuce, and peas are just a few of the veggies your fish might enjoy. You can attach a piece of vegetable inside the tank with a vegetable clip, or cut it into small pieces to feed to your fish. Be sure to remove any uneaten veggies within 48 hours, or it will start to rot in your tank.

Tips:

• If you are going to hand-feed, place the food in your hand and let the fish swim up and pick the food out of your hand.
• A fish's stomach is the same size as his eye.
• If you overfeed, and your fish is looking bloated, take a frozen pea. Thaw it, shell it, and cut it into small pieces to feed to your fish. This will help with digestion.
• You may need more than one type of fish food if you own many different species of fish. Be sure it is the right kind for that particular breed.

Warnings:

•  you are unsure of the food you are going to feed to a fish then don't feed it this as if it is not stated that your fish type can eat this food, it probably can't. E.g.: Angelfish are all allergic to bloodworms and will die if fed them. Take caution when feeding foods you are uncertain of.
• Don't feed a betta as much as he can eat in 2-3 minutes; he will gorge himself! Instead, give him 3 or 4 pellets.
• Be careful not to overfeed! Fish can die if you let them eat too much.
• If you are feeding your fish live food, you should make sure that the food is healthy and parasite-free.
• Certain foods are high in fat. Your fish will love these, but they should only be given occasionally.