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Marine Aquaria and
Miniature Reefs

Dynamic Aquaria : Building
Living Ecosystems

Aquarium Plants: The
Practical Guide

Handbook of Fish Diseases


Freshwater Fish Compatibility Chart

The chart below contains most of the more common freshwater fish that you will 
find at your local pet shop. I have divided the list into 3 categories of behavior, and
defined as follows: 

Community Fish : 
Unless marked with a note, these fish can be safely mixed together in the same

Semi-Aggressive : These fish are usually peaceful when they are small, but can
become fin nippers or chase the others around the tank when they get bigger. If 
you really want to put one of these fish in your community tank, you can, but keep 
an eye on them as they get bigger.

Aggressive Fish : Do not mix these fish with any other type fish except similar
sized aggressive fish. They will bully and even eat smaller and more timid fish.

Category  Community Semi-Aggressive Aggressive
Anabantids Dwarf Gourami  
Flame Gourami 
Opaline Gourami
Pearl Gourami
Siamese Fighting Fish/Betta(1)
Spiketailed Paradisefish
Honey Gourami
Kissing Gourami
Black Paradisefish
Catfish Banjo Catfish 
Chinese Algae Eater
Green Catfish
Leopard Catfish
Spotted Catfish
Upside Down Catfish
Bumble Bee Catfish  
Charachins Black Neon Tetra 
Black Phantom Tetra 
Cardinal Tetra 
Congo Tetra 
Emperor Tetra
Flame Tetra
Glowlight Tetra
Head & Tail Light Tetra
Neon Tetra
Rummy Nosed Tetra
Serpae Tetra
Penguin Fish
X-Ray Fish
Bleeding Heart Tetra
Black Widow 
Buenos Aires Tetra
Silver Dollar
Red Belly Piranha
Cichlids Angelfish  
Blue Acara  
Discus (2) 
Green Terror
Jack Dempsey
Red Oscar
Cyprinids Cherry Barb 
Bala (Tri-Color) Shark 
Black Shark 
Blue Danio 
Giant Danio 
White Cloud 
Zebra Danio
Harlequin Rasbora
Flying Fox
Green Tiger Barb
Red Tailed Shark
Rosy Barb
Tiger Barb
Tinfoil Barb
Killifish Lyretail    
Livebearers Guppy 
Swordtail Knife Livebearer
Loaches Clown Loach
Dwarf Loach
Horseface Loach
Unclassified Australian Rainbowfish 
Boesmani Rainbowfish 
Boesman's Rainbowfish 
Bumble Bee Goby
Elephant Nose
Freshwater Puffer
Butterfly Fish

(1) Only 1 male Siamese Fighting Fish/Betta per tank. 2 Males will fight to the death
if they are in the same tank! You can have as many females in the tank as you wish.

(2) Discus should not be kept with other fish other than catfish, loaches, neons, or
cardinal tetras. This is due to the fact that they are very susceptible to disease, they
require a warmer water temperature (85 degrees F), and are sometimes slow eaters
and will not fight for food.


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