Freshwater Fish Compatibility Chart

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

  • Community Fish: Unless marked with a note, these fish can be safely mixed together in the same aquarium.
  • 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.
Community Semi-Aggressive Aggressive
Category Anabantids
Dwarf Gourami Honey Gourami Black Paradisefish
Flame Gourami Kissing Gourami  
Opaline Gourami    
Pearl Gourami    
Siamese Fighting Fish/Betta * (1)    
Spiketailed Paradisefish    
Category Catfish
Banjo Catfish Bumble Bee Catfish  
Chinese Algae Eater    
Green Catfish    
Leopard Catfish    
Spotted Catfish    
Upside Down Catfish    
Category Characins
Black Neon Tetra Black Widow Red Belly Piranha
Black Phantom Tetra Bleeding Heart Tetra  
Cardinal Tetra Buenos Aires Tetra  
Congo Tetra Silver Dollar  
Emperor Tetra    
Flame Tetra    
Glowlight Tetra    
Head & Tail Light Tetra    
Neon Tetra    
Rummy Nosed Tetra    
Serpae Tetra    
Penguin Fish    
X-Ray Fish    
Category Cichlids
Angelfish Firemouth Convict
Blue Acara Severum Green Terror
Discus * (2)   Jack Dempsey
Festivum   Red Oscar
Category Cyprinids
Cherry Barb Flying Fox  
Bala (Tri-Color) Shark Green Tiger Barb  
Black Shark Red Tailed Shark  
Blue Danio Rosy Barb  
Giant Danio Tiger Barb  
White Cloud Tinfoil Barb  
Zebra Danio    
Harlequin Rasbora    
Category Killifish
Category Livebearers
Guppy Swordtail Knife Livebearer
Category Loaches
Clown Loach    
Dwarf Loach    
Horseface Loach    
Category Unclassified
Australian Rainbowfish Archer Butterfly Fish
Boesmani Rainbowfish Freshwater Puffer  
Bumble Bee Goby    
Elephant Nose    

* Notes:

  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.