Goldfish & cichlids have different food requirements then tropical fish, only feed goldfish & cichlids food made specifically for them. Likewise, only feed tropical fish food made for them.
Look at the pictures on the containers of food, this is an indicator on what you should buy. It’s the “easiest way for dummies” to get the right food!
Algae eaters are herbivores. If you do not have enough of this fuzzy green growth in the aquarium, you will need to toss an occasional algae wafer in there for your Plecostomus / sucker fish.
Bottom feeders need sinking pellets while regular fish need food that floats. Notice where the fish spend their time and purchase food accordingly.
Fish are classified as omnivores, carnivores & herbivores. Knowing this, you can tailor their diet to their individual needs. Most tropical species are omnivorous so a regular tropical flake will suffice the average hobbyist.
Some fish are strictly carnivores like certain types of large cichlids. Betta fish are also carnivores but pellet foods are made with this requirement in mind. Carnivorous fish thrive on frozen or freeze dried insects/worms, the easiest way to replicate a natural diet.
Fish flakes are well suited to the average schooling tropical species like tetras, barbs etc. Since most tropical fish are omnivores, supplement with a treat of brine shrimp or bloodworms. This will vary their diet, the healthier the fish, a more vivid display of color will be noticeable in your aquarium.
Going away on holidays? The “weekend” or “vacation” feeding pyramids are not recommeded. The slow release block can cloud your water and affect the water chemistry. Fish can easily live 2 even 3 weeks without food. Remember, they eat micro bacteria in the water so they won’t starve!
Feed your fish fish 5 days a week. It is good for their metabolism to stagger dates and leave a few fasting days. Feed young fish twice a day to accelerate growth but never feed more than they can consume within about 2 minutes.
Feed flakes in “pinches” to prevent extra food getting sucked into the filter. Once they’ve eaten every flake from the first pinch, feed a second & third pinch. Dumping a huge amount of food at once will result in waste accumulating at the bottom and overabundance of food rotting on the filter pad after it’s been sucked up.