Choosing Shoaling Aquarium Fish


.Shoaling Fish


Choose the right fish for your aquarium: they should reflect a natural harmony with plants and decoration

Bear in mind when introducing new fish: Any change of water and environment constitutes a stress situation for the fish and can activate pathogenic agents. If at all possible a separate quarantine tank should be kept in which the fish can be observed and, if necessary, treated prior to moving them into the community aquarium. If at any time a treatment against fish ailments directly in the aquarium becomes necessary you have to remember:

Medication products cannot distinguish between harmful and useful micro-organisms and will very often damage or even destroy the vital reducing bacteria in the aquarium. This can cause a serious set-back, particularly during the running-in period of the first 2 months. We recommend, therefore, after treatment is completed:

  1. A 50% water change as soon as possible
  2. Repeat 50% water change 3-4 days later
  3. After that resume normal routine of 25% water change. Don't forget fertilizers and water treatments.

This will encourage the micro-organisms to regenerate and to re-establish the "biological balance" as quickly as possible. If the plants have taken too much of a knock the aquarium has to be "run in" again.


Shoaling fish

The most sought-after fish species are the ones which swim in a close shoal. However, whether they will shoal mainly depends on: the size of tank.

Only very few species will shoal in an aquarium smaller than 120x50x50 cm as they need a certain amount of space in which they can actually "move along" as a shoal.

As some fish prefer to swim just below the surface and others tend to occupy the middle or the lower waters it makes sense to take this into consideration when choosing your fish community.


Surface fish

Aplocheilus blockii u.a. Green pacha
Carnegiella strigata Marbled hatchetfish
Gasteropelecus maculatus Spotted hatchetfish
Dermogenys pusilus Half-beak


Middle water, upper region

Aphyosemion Killifish
Aplocheilus lineatus Pancha species
Arnoldichthys spilopterus Red-eyed characin
Barbus tetrazona Tiger barb
Bedotia greayi Madagascar rainbow fish
Brycinus longipinnis Long-finned characin
Danio Danio
Gymnocorymbus ternetzi Black tetra
Hemigrammupetersius caud. Yellow Congo tetra
Melanotaenia Rainbow fish
Moenkhausia sanctaefilomenae Red-eyed tetra
Nannobrycon All pencilfish
Rasbora caudimaculata Red scissors-tail
Rasbora pauciperforata Red striped rasbora
Rasbora trilineata Scissors-tail
Thayeria boehlkei Boehlke's penguin fish
Thayeria obliqua Penguin fish
Telmatnerina ladigesi Celebes sailfish
Xiphophorus maculatus Platy


Middle water, lower region

Barbus barilioides Orange barb
Barbus cumingi Cuming's barb
Barbus nigrofasciatus Black ruby
Barbus semifassciolatus Green barb
Cheirodon axelrodi Cardinal tetra
Hasemania nana Silver-tipped tetra
Hemigrammus erythrozonus Glowlight tetra
Hemigrammus ocellifer Beacon fish
Hemigrammus pulcher Pretty tetra
Hemigrammus rhodostomus Rummy-nosed tetra
Hemigrammus rodwayi Gold tetra
Hyphessobrycon erythrostigma Bleeding heart tetra
Hyphessobrycon herbertaxelrodi Black neon
Hyphessobrycon heterorhabdus Flag tetra
Hyphessobrycon socolofi Lesser bleeding heart
Megalamphodus Phantom tetra
Petitella georgiae False rummy-nose
Phenacogrammus interruptus Blue Congo tetra
Rasbora heteromorpha + hengeli Harlequin fish
Rasbora vaterifloris Peraly rasbora


Bottom fish

Aequidens curviceps Flag cichlid
Apistogramma Dwarf cichlid
Barbus oligolepis Island barb
Barbus titeya Cherry barb
Corydoras many Corydoras species
Crenicara Crenicara cichlid
Nannacara anomala Golden-eyed dwarf cichlid
Papiliochromis ramirezi Ramirezi dwarf cichlid
Pelvicachromis spec. Kribensis


Other Tropical Fish Articles Information