What do fish not eat

Proper fish feeding

How to feed your aquarium fish properly! Feeding your fish is one of the most important maintenance measures. The question of how to feed the aquarium fish correctly is answered in detail in this article.

What is the correct feeding? As almost always, there is no one-size-fits-all answer for every situation. What the ideal feeding of your aquarium fish looks like depends to a large extent on the species kept, the number of fish and the size of the aquarium.

It is logical that the feeding is best tailored to the needs of your fish, that the feeding is varied.

Fine granulated food for smaller fish and shrimp.

How Much Feeding? The right amount.

The right amount of food is different in every aquarium. You have to find out for yourself what the right amount of food is for your aquarium. Not too much and not too little, that is the goal. This is how you do it:

Not too much

Most newcomers to the aquarium hobby are feeding their fish too much. Are you one of them and prefer to feed a little more so that no fish has to go hungry? Or do you feed more often because you or others like to watch the fish eat? Not a good idea.

How do you know if you are overfeeding? Here are a few examples: You probably feed too much if your fish are really spherical - this is not very healthy for the animals. It is also too much if there is still food floating around in the aquarium after 5 minutes or more. Food tablets can be an exception here, as these are often slowly shredded by catfish.

If the algae and snails are thriving really well in your aquarium, this can also be an indication that you are overfeeding. This happens especially when you feed so much that some of the feed sinks to the ground and remains there.

Some species still eat when they are actually already full, but if you feed once and the fish do not accept the food or spit it out again, it might just be too much. Try a fast day and reduce the amount step by step.

Not to less

If the aquarium fish don't get enough food, they either worry or starve. But that happens a lot less than you might think. A lot of fish don't just eat the food you give them. Herbivores can feed on the aquarium plants or algae, and catfish nibble on the roots.

Still: not feeding enough is not good. Here are some tips on how to recognize when you are not feeding enough:

If the fish really have to fight over that little bit of food, it may not be enough. There should be at least a few flakes per fish so that it is not too little.

You can recognize malnourished fish when the belly is no longer nice and round, but curved inward. In this case, feed a little more and see if the fish gain weight.


All fish are given enough food once a day, but they are not overfed. The meal can take 1-2 minutes, shorter is probably not enough. As long as the fish eat the food as soon as you add it to the aquarium, everything is fine. In these 1-2 minutes, it is better to add smaller portions several times to the aquarium to avoid a lot of food sinking to the bottom. If you have a lot of bottom fish in the aquarium, feed them specifically with food tablets. If you throw so much flake food into the aquarium that something sinks for the bottom fish, it was probably too much.

How often? Basically every day.

You should generally feed your aquarium fish once a day. More often, feeding only makes sense if you are raising young fish, for example.

When feeding the fish, always keep in mind that each time you feed, it is a drain on the water. This means that you should never feed your fish just for fun.

Less is okay in exceptional cases, for example when you are on vacation. More on the subject of vacations and aquariums.

Fasting for fish

A regular fast day without food is not only not a problem, it is even recommended. Even in nature, the available food supply is not exactly the same every day. The animals get along wonderfully with these fluctuations in how much they get to eat.

For some species, a several-week reduction in the amount of food, followed by a period of more generous feeding, is even a trigger to reproduce. You should only use this if you know exactly what you are doing and if all the animals in the aquarium can handle it.

My fish are not fed one day a week and so far I have only had good experiences. A positive effect of one fast day per week is in any case that the pollution of the water through excretions is somewhat reduced. This also helps to curb the growth of algae. More about algae control.

If you have young animals in the aquarium, you should better not do the fasting days, because they need regular food.

Feed what Overview of feed types

For their health and splendor of color, aquarium fish need adapted and vitamin-rich food. Which form of food is right for your fish depends on where they mainly eat their food. For example, armored catfish Corydoras prefer to eat from the ground and rarely come to the surface. Other ornamental fish feed in the upper part of the tank or on the surface of the water.

The aquarium fish differ in what they eat under natural conditions. There are pure herbivores, fish that actually eat everything and fish that feed on other aquatic animals.

There is a large variety of feed in specialist shops and you should use that too.

1) Food tablets 2) Freeze-vacuum-dried food eg. Mosquito larvae, Artemia Shrimps 3) Flake food 4) Granulated food

Armored catfish are fed frozen, red mosquito larvae.

In the case of ornamental fish that have a purely vegetable diet, it is very important to feed them with sufficient vegetable flake food as well as vegetables. Too often these herbivores will otherwise start to rasp off the beautiful aquatic plants.

A catfish rasps at a root.

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