Best Aquarium in Comparison.

Aquarium Reviews & Buyer Guide.

If you want to keep crayfish, fish or other underwater animals, you should do this in as large an aquarium as possible. Small and rudimentary models are available from just over ten euros.

However, for those that hold 180 liters, for example, and come with almost every feature, you will quickly pay over 500 euros. In return, you can expect things like filters, lighting, heating and a base cabinet. The good news is that even much cheaper products offer many of these aspects. Browse through our test and comparison table and find the wet home for your underwater animals!

Best Aquarium Comparison

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The 10-Best Aquariums


Aquarium Buying Guide:

How to choose the right product from the above aquarium test or comparison

  • Most commercial aquariums, like all the models in our aquarium comparison, are freshwater aquariums. They are easier to maintain than tanks with salt water and are suitable for small tropical fish, plants, crabs, snails and shrimp.
    Small nano aquariums up to 60 l volume are eye-catchers in the interior design, which contribute to a cozy ambience with lighting.
  • There are different designs that adapt to individual living situations. Classic is the rectangle, which allows the best panoramic aquarium view.
  • An aquarium set already includes pump, filter, glass tank and heater. In addition, you almost always have to buy cleaning materials, decorative elements and, of course, marine life. However, they can move in only two weeks after setting up, when necessary bacteria have formed.

Vive le fish: An aquarium is a zoo specialized in water (aqua is Latin and means water). There are huge underwater worlds that are visited by young and old. Once you have acquired a taste for the big show aquarium, you may think of buying a small home aquarium for your own four walls. Illuminated aquariums with small inhabitants are a real eye-catcher in the interior. In our aquarium comparison 2021 we give you a buying guide to hand and tell you what criteria must be met so that an aquarium test winner.

How does an aquarium work?

An aquarium is the artificial housing for ornamental fish, small invertebrates, mollusks, crayfish and aquarium plants. This housing is set up by the aquarist, which you are when you buy an aquarium. Aquaristics involves the care of living creatures in the aquarium. In it a nitrogen cycle takes place, which does not work without human intervention. These interventions are necessary to feed the fish and to keep the level of nitrates in the water low, otherwise there may be problems with the growth of plants. A filter, which is included in an aquarium set, breaks down pollution and bacteria and provides a stable biological system.

What types of aquariums are there?

There are a variety of aquariums adapted to the needs of the aquarist, or to those, the desired fish. In particular, if the aquarium is to make beginners happy, smaller freshwater aquariums have become popular. In our aquarium comparison 2021, we have compared commercially available models that can be purchased either as a complete set, or as a single aquarium tank.

Freshwater aquarium

The commercial aquarium complete set is filled with fresh water. The basis for this type is a low to non-existent salt water content. The glass tank is filled with ordinary aquarium water to create a living space for small fish, algae eaters and plants. Therefore, adding salt is not necessary, but care should be taken when selecting fish to ensure that they are freshwater-safe. If you do not have aquarium water, you can take tap water and add water conditioner to it.

Saltwater aquarium

Popular: The nano aquarium from Dennerle in cube form.

The saltwater aquarium is more complex and complicated to keep than the freshwater aquarium, because a certain salt content is always required. If the aquarium is to be suitable for beginners, a freshwater complete set is suitable, which accommodates exotic (tropical) small fish, shrimps and plants. Both online and at a well-stocked aquatics store, you can choose the right volume for you if you want to buy an aquarium.

What criteria should be looked for when buying an aquarium?

Beginners who want to buy an aquarium are usually advised to choose a low-maintenance freshwater aquarium. Once you have decided on this, there are other buying criteria to consider. In the following part of our aquarium comparison, we have listed the most important criteria so that you can find your personal aquarium test winner in an aquarium online store, for example.


In general, the following applies to aquariums: The larger, the more expensive they are to purchase. So if you are looking for an inexpensive aquarium for children or as an eye-catcher in the living room, you will find it in a starter set with volumes between 10 and 60 liters. If the nano aquarium holds 120 liters, a stable base is required. For an aquarium with a base cabinet, this is already available, otherwise we recommend a stable chest of drawers.

Tip: When choosing the best aquarium for the living room, the following applies: per centimeter of fish length, you should have 1 to 2 liters of water available. When testing aquariums, however, it must be taken into account that gravel or sand and decoration already take up volume.


The most commonly used material for aquariums from our aquarium comparison is glass. It is robust and is glued at the corners with silicone, so that no water can leak. The advantage of glass is easy cleaning, good visibility and that scratches do not occur as quickly as with plastic, for example. Especially for very cheap aquariums, Plexiglas or plastic can also be used, but scratches can quickly become visible, which is not recommended for a design aquarium.
Advantages and disadvantages of glass aquarium tanks


  • robust, not susceptible to scratches
  • no problem with large volumes
  • clear view with good cleaning


  • more expensive than plastic
  • difficult

Aquarium accessories

Aquarium accessories are used especially for the aquarium ecosystem and cleaning. In an aquarium set is always supplied a pump and a light – usually LED – to provide aquarium lighting and the necessary water circulation. Equally important is the aquarium filter, which is needed for a largely dirt-free glass tank. While internal or external filters and a cover still belong to the standard equipment, aquarium beginners usually have to buy a net, gravel, thermometer, a film (also background film) and substrate to make the aquarium setup complete.

Aquarium lighting

The special ambience of an aquarium comes from the proper lighting of the underwater landscape. Like indoor fountains or fairy lights, the terrarium can also contribute to the lighting design in your living room. In most cases, the lamps are warm white. However, if you prefer a different aquarium light color or intensity, you can change the LEDs on all models from our aquarium comparison.


Saltwater and freshwater aquariums can be divided into different types and categories of construction. The best aquarium should not only make a good figure in terms of quality, but also fit your interior design, if the aquarium is placed in the living room. In our aquarium guide we present the following types.

How to properly set up an aquarium?

Setting up your first aquarium is a bit time-consuming, but it can be fun. So you or your children will become interior designers of the small underwater zoo. Below, we list the most important steps to follow when setting up an aquarium.

Choose the right place: The aquarium tank should be placed in a rather dark area and on a resilient base.
Decoration: choose stones, gravel, roots or ornaments as you like. However, wash them thoroughly before use.
Back wall design: you can add colorful accents with a background foil. You can buy the foil online or in any aquarium store.
Substrate: The first thing to do is to put in the substrate and gravel. For a nice room optics we recommend to install an elevation with more gravel in the rear area.
Planting: Now the aquarium construction can begin. Well known plants are Anubias, Echinodorus or Camomba. Especially fast and easy to care for is the water plant, which every aquarium beginner should plant. The more plants you put in the aquarium, the better it is for the biotope. Therefore, the following applies: place plants densely.
Fix apparatus: Install CO2 aquarium equipment, filter and pump according to the instruction manual. An aquarium without a filter is not recommended, especially for beginners, because the effort is higher.
Fill in water: To avoid turbulence, skilled aquarists do not pour water directly into the tank. They put in a plate on which the water is poured. In this way, it is distributed without confusing everything.
Water test: An aquarium without fish is of course not a real underwater zoo. To make sure that the water is of sufficient quality, the water values must be checked. Again, the manufacturer’s instructions for use will help. A refractometer can be used to check water quality.
Introduce animals: If you have already bought animals for e.g. the nano aquarium or shrimp aquarium, they are kept in bags. The water temperature there is different than in your tank. Put the bags with the aquarium fish into the water and get the fish used to the new temperature by a constant water exchange. But be careful: wait up to two weeks before you put the fish in, so that necessary bacteria can form in the water.

What are the best tips for an aquarium cleaning?

To maintain the ecosystem in your home aquarium, it is necessary to perform regular cleaning – even with the best aquarium toxins are formed. If you want to clean your aquarium tank, a wide range of aquarium accessories is necessary. These include landing nets, cleaning rags and buckets for changing the water. How exactly you need to do this, is explained in the following video on how to clean the aquarium:

How many fish are good in the aquarium?

How much electricity does an aquarium consume?

The aquarium pump runs around the clock, at times aquarium lighting and heating are added. This causes electricity costs, which for a medium-sized aquarium with 100 l is about the same as for a freezer.

Since aquariums have different volumes, it is necessary to vary between sizes to answer the question. Basically, aquarists use the rule of thumb “one centimeter of fish per liter of water.” It should be noted that firstly the total length of the fish including fin is meant and not the raw volume can be taken from the aquarium. If the aquarium holds 60 l, you have to subtract e.g. volume for substrate, gravel, decoration and roots. Therefore, it is advisable to keep an eye on how many liters of water you actually put in. You should also find out about the social behavior of your aquarium fish and how densely populated they like it.

How much CO2 in the aquarium?

Many young aquarists wonder how much CO2 the aquarium can tolerate. However, it is important to consider the individual needs of your marine inhabitants as well as the aquarium size and plant density. The nano aquarium manufacturer Dennerle recommends a CO2 content between 15 and 30 mg/liter. This value can be regulated by the number of bubbles.

The basic rule is 10 bubbles per minute per 100 liters of water. For more detailed information on pH values, carbonate hardness and CO2 regulation via your accessories, please refer to the respective operating instructions.

How many degrees must an aquarium have?

If the aquarium is to make beginners or novices happy, tropical fish are usually purchased. These like it warm, which is why there are also heaters in most aquarium complete sets. These maintain a constant temperature. Between 24 and 28 degrees most fish or shrimp tolerate. Other fish, such as native goldfish also live at 15 to 20 degrees. If you want to start a community tank, we recommend to check the temperature requirements of the different fish first.

What to do against algae?

Once algae have appeared, it is not enough just to remove them. You must also find out the cause to avoid future algae growth. Causes can be: too long lighting times; high nitrate or phosphate levels; wrong LED tubes; too much fish food or too much sunlight. Remedies such as Algenex only help in the short term and can upset the aquarium ecosystem, so in addition to combating the cause, we also advise shortening the exposure times.

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