Freshwater Aquarium Fish Compatibility

It is very important to understand the freshwater aquarium fish compatibility before setting your tank. Not all fish live together peacefully and you would not want your beautiful tank to be in a mess. The following article will provide a chart that outlines the compatibility between fish.
PetPonder Staff
Freshwater aquarium fish are easy to care and very enjoyable pets. They can easily live in a small 5 gallon tank and love swimming in a 100 gallon tank. You can house your pet in a glass or acrylic tank. Use different substrates and decorative ornamental pieces, like rocks, live plants, plastic plants, and even some fancy plastic aquarium toys. The tank can be lit up with a bulb and you can place a filter to keep the water clean. You can even place a heater to provide some warmth to them. You can use normal tap water as the medium for your pet to live in.
As an aquarium enthusiast, you can choose from a variety of fish. You should keep in mind that the fish should be similar in size to avoid larger ones from picking on the smaller ones or the tiny ones eating up the fins of the larger fish. Also, they should not compete with each other for food, as it will result in starvation and death of the weaker lot. You need to choose the right pet for your aquarium so that they can peacefully exist alongside each other.
Basics of Their Compatibility
Fish are very sensitive and delicate creatures. Any amount of stress can lead to their untimely death. The freshwater fish are divided into 3 categories according to their behavior:
  • Community Fish: They are peace-loving and happy-go-lucky. They do not get into fights and are compatible with all the others. You can safely mix and match different community species in your tank.
  • Semi-aggressive Fish: These are a bit high-strung and will not shy away and would occasionally nip and bite other fish. They tend to be peaceful when small, but as they increase in size they turn into fin-nipping rogues. They will chase and tire the others. They are good for community tanks, but make sure you keep an eye on them as they grow bigger in size.
  • Aggressive Fish: Just as the name suggests, these fish can be called the fighters. They love to pick on little ones and are not compatible with any other species. They can live around with other aggressive ones of their own kind or size. However, they have a habit of bullying weaker ones by pushing them around.
The Compatibility Chart
Category Community Semi-aggressive Aggressive
Anabantids Dwarf Gourami
Flame Gourami
Opaline Gourami
Pearl Gourami
Siamese Fighting Fish/Betta Fish
Spike-tailed Paradise fish
Honey Gourami
Kissing Gourami
Black Paradise fish
Aquarium 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 and Tail Light Tetra
Neon Tetra Fish
Rummy-nosed Tetra
Serpae Tetra
Penguin Fish
X-Ray Fish
Bleeding Heart Tetra
Black Widow
Buenos Aires Tetra
Silver Dollar
Red Belly Piranha
Cichlids Freshwater Angelfish
Blue Acara
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 fish
Swordtail Knife Livebearer
Loaches Clown Loach
Dwarf Loach
Horseface Loach
Unclassified Australian Rainbowfish
Boesmani Rainbow fish
Boesman's Rainbow fish
Bumble Bee Goby
Elephant Nose
Rainbow fish
Archer Butterfly Fish

This chart will help you know which ones are compatible. You can try keeping some of the community fish with the semi-aggressive species, but make sure you always have an eye on them. Do not introduce the aggressive ones to the tank, else most of your peace-loving fish will end up dead.