Making the right choice of fish

The choice of fish is very important – as is the shop where you buy them. There are thousands of species, but if you’re a beginner at fish-keeping, we advise you to choose species that are easy to rear, inexpensive, and highly compatible together.


  • The quality of water chosen: cold water / warm water, fresh water / sea water. Avoid diverse mixes of fish at all costs: for instance, don’t mix goldfish (cold-water) with tropical fish (warm-water).
  • Aquarium size: the fish need living space proportionally to their size. For their comfort, avoid large species in smaller aquariums (less than 100 litres). Prior to any purchase, check the size of certain species of fish which are sold young but may reach 30 cm when adult and be unsuitable for your aquarium. This is particularly the case for cold-water fish, e.g. koi carp.
  • Ease of care, bearing in mind your experience and the requirements of certain varieties: beginners should choose species that are easy to care for and inexpensive. More experienced fish-keepers may choose more demanding species that are rarer but also more expensive, e.g. discus fish.Compatibility of species; take particular care with aggressive species, which it’s difficult for smaller fish to live alongside:
    - avoid keeping widow rockfish and brill with small fish;
    - gouramis and angelfish can cohabit but they will not tolerate fish that are smaller than them;
    - African cichlids need to be kept in specific tanks: they cannot live alongside other species, and also require a particular biotope (mineral decor with no aquatic plants);
    - You’ll have far fewer problems with species compatibility for cold-water fish than with warm-water fish. However, if you add large fish, take care that other fish in the same species don’t nibble their fins.

Don’t forget that the quantity and choice of your fish should be in direct proportion to your experience and the size of your aquarium. Just as a large volume of water will be a lot more stable in terms of biological balance and require less maintenance, mistakes in the choice of fish (in terms of species and quantity) will be less harmful in a large aquarium than in a small aquarium. In case of doubt, don’t hesitate to contact us.


There is of course less variety in cold-water species than for warm-water species, but you should find fish for your aquarium without any problem!

There is of course less variety in cold-water species than for warm-water species, but you should find fish for your aquarium without any problem!
The main fish for cold-water aquariums are goldfish or varieties derived from them by breeding. Goldfish come from Asia. In spite of their name there are many different colours (red, orange, yellow, white, spotted, etc.), resulting from over one thousand years of fish-keeping and breeding. They first arrived in Europe in the eighteenth century, and there are now a large number of varieties, a sample of which is given below.

cold water fish

Poisson rouge communGOLDFISH

Size: up to 20 cm
Color : united, red, yellow or orange
Characteristics: very resistant (up to 0°C)



Size: up to25 cm
Color : Blue mottled red of white and black
Characteristics: Less rustic than the common goldfish



Size: up to30 cm
Color : one color : red, yellow or orange
Characteristics : Caudal fin highly developed (up to 2/3 of total length)



Size: up to 20 cm
Color : bicolor red and white
Characteristics: very similar to Comet



Size: up to 30 cm
Color : All combination of red, black and white
Characteristics: Stocky fish but quiet with magnificent sails


black-moorBlack Moor

Size: up to 20 cm
Color : black
Characteristics: Recognizable by its globular eyes and its black color


uranoscopeUranoscope (oR « Bubble Eye »)

Size: jusqu’à 20 cm
Color : All combination of red, black and white
Characteristics: Large pockets filled with very fragile fluid
Delicate variety rather reserved for persons with experience in the aquarium



Size: up to 15 cm
Color :All combinations of red, black and white
Characteristics: Strange variety with eyes directed upwards



Size : up to 30 cm
Color : All combinations of red, black and white
Characteristics: Fish with beautiful double fins and various colors


Warm-water fish


Warm-water fish have the advantage of often being very colourful, and there’s a wide diversity of species that you can put in your aquarium. The choice of your fish, and their care, are therefore very important considerations.

The species listed below are given as examples and in no way represent the entire range of choices possible. Our presentation here is a compromise between ease of care (compatible fish that are not very demanding), cost (a few euros per fish), and colour.


Between 2 and 4 cm long



Color : Wide variety of colors, from red (coral) to yellow and blue. 
Characteristics: Ovoviviparous, extremely prolific reproduction. 
Perfectly suited for beginners


Color : Usually yellow, tail marked red
Characteristics: Species less hybridized than common platy.


platy perroquetGuppy (Poecilia reticulata)

Color : Great variety of colors, especially in males
Characteristics: Ovoviviparous, easy reproduction. Very robust
Suitable for beginners


Color : White, or orange, with a well-marked black triangle on the tail
Characteristics: Ovoviviparous, lives with several (at least 4 fish). Peaceful with other fish.


Color : Lower part red and white, lateral line of an electric blue
Characteristics: Peaceful species, lives with several (at least 5 fish).


Color : Brown back, red belly and luminescent blue lateral line
Characteristics: Peaceful species, lives with several (at least 5 fish).



Between 4 and 7 cm long – only for aquariums of over 40 litres


Color : black or yellow
Characteristics: nettoyeur de vitre. Un ou deux individus




Color : Gray, black lateral bande
Characteristics: Algae eater, put mangrove roots ; To be introduced by 2 or 3.


Color : white and black
Characteristics: Discreet background cleaner. To be introduced by 2 or 3. Many species.

gourami nain

COLISA LALIA (Gourami nain)

Color : Streaked with red and turquoise
Characteristics: Pelvic fins evolved into long tactile threads. To be introduced by couple.

combattant du siamBetta splendens (COMBATTANT DU SIAM)

Color : Blue, purple or red
Characteristics: Great majestic sails. Never introduce two males together (very aggressive)

molly voilePoecilia velifera (MOLLY)

Color : Great variety of colors
Characteristics: Ovoviviparous. To be introduced by couple.


Porte-épéeXiphophorus hellerii

Color : orange-red
Characteristics: Ovoviviparous. To be introduced by couple.


danio voileDanio rerio

Color : Striped blue sky and yellow
Characteristics: Very lively, easy reproduction, to be introduced by two or three.


Tétra Nez-RougeHemigrammus rhodostomus

Color : Red head, white body and caudal fin striped in black
Characteristics: to introduce by 5 or 6 minimum



Over 6 cm long – only for aquariums of over 100 litres

Loche, botiaChromobotia macracantha

Color : black and orange stripes
Characteristics : snail eater, to be added in pairs


scalairePterophyllum scalare

Color : gray, black, white, yellow
Characteristics: may be aggressive towards other fish.


GouramiColisa sp., Trichogaster sp.

Color : Yellow, blue or spotted
Characteristics : to introduce by 2 minimum.



Color : Iridescent blue and yellow bronze
Characteristics : Ovovivipare, to introduce by six minimum..


Apisto cacatoèsApistogramma cacatuoides

Color : Yellow, red, bleu
Characteristics : Territorial but peaceful. Two females per male.


discusSymphysodon sp. (DISCUS)

Color : red, green, blue
Characteristics : Considered by many to be the "must" of freshwater fish!




The maximum number of fish depends directly on their size and the capacity of your aquarium. For each of our aquariums, we make a recommendation for the maximum number of fish to be added. Don’t forget to take into account the growth of your fish, and where applicable, reproduction.

In any case, for a freshwater aquarium we recommend that the following ratios should not be exceeded:


  • Small fish: 5 litres per fish
  • Medium-sized fish: 10 litres per fish
  • Large fish: 30 litres per fish


  • allow approximately one goldfish for 20 litres, bearing in mind that a goldfish can reach a size of 20-30 cm in a suitable, non-overcrowded environment.

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