Sharing some important fish names in groups you can find and keep them together in a same tank, making it easy for you guys to select your fish wisely from your LFS. And if taken proper care and giving them good environment as they need, your fish mortality rate will definitely lower down
MIXED TROPICAL - White Clouds,Fancy Guppies, Corydoras Catfish, Glass Fish, Neon Tetras, Glowlight Tetras, Harlequin Rasboras, Honey Gouramis,and Ghost Shrimp. These fish are compatible and a few of them will do well in a 15-gallon aquarium with warm water. These fish are not compatible with most other species of fish. Can be kept with Discus if both are grown together.
SCHOOLING LOVERS - Danios, Swordtails, Mollies, and Platies, plus Bigger Tetras such as Black Skirt Tetras, Painted Tetras, Serpae Tetras, Red Eye Tetras, Black Neon Tetras, and Silver Tip Tetras. A few of these fish will do well in a 15-gallon aquarium with warm water. Each fish species in this group lives best in a group of 6-8 member of that species. More school means more activity.
ANGELS - Freshwater Angels, plus Dwarf Gouramis and Neon Blue Gouramis, plus Neon Blue Rainbows make a nice compatible group of fish. These fish require a warm water aquarium. Eventually they’ll need an aquarium with at least 29 gallons of water, and an aquarium at least 18 inches tall is recommended for Angels. A Plecostomus Catfish is also compatible with these fish.
THE MILD AGGRESSIVE - Barbs, Gouramis, Sharks, Eels, and Loaches. Tiger Barbs and Tinfoil Barbs, plus Blue, Gold, and Opaline Gouramis, plus Bala Sharks, Red Tail Sharks, Rainbow Sharks, and White Tip Sharks.These fish are mildly aggressive and compatible with each other. They will grow fast and need at least a 35-40gallon aquarium with warm water. They will need a much bigger aquarium when they are full size.
SEMI-AGGRESSIVE - Firemouth, Convict, Pink Convict, Texas Cichlid, Jack Dempsey and other New World Cichlids are very aggressive fish. But many aquarists enjoy watching them dig, defend their territories, and care for baby fish. Large Plecostomus Catfish, Synodontis Catfish, and White Tip Sharks are usually compatible with New World Cichlids. Within a year or so a group of these fish will need an aquarium with at least 50 gallons of warm water. Eventually these fish will need an even bigger aquarium.
AGGRESSIVE - Mbuna Cichlids. Auratus, Kenyi, Red Zebra, Pindani, Johanni, etc. Mbunas are from Lake Malawi in East Africa where they live among the piles of large rocks along the shore. Mbunas are aggressive and need to be kept in a group with at least 12 other Mbunas. If kept in a smaller group, the strongest fish will make life miserable for the weaker fish. A group of 12 adult Mbunas will need a warm water aquarium with at least 50 gallons. Synodontis Catfish are compatible with Mbuna Cichlids. Eventually a group of Mbunas will need an aquarium with at least 80 gallons of water. Click here to read a story about an 80-gallon aquarium with Mbunas. Click here for more about warm water aquariums.
OSCARS - Oscars and Large Fish. Red Oscars, Black Oscars, Tiger Oscars, and Pink Oscars will grow fast to very large sizes. Oscars are compatible with Bigger Pacus, White Tip Sharks and Medium and Large Plecostomus. These fish will grow fast and soon need a 50-gallon aquarium with warm water. Eventually these fish will need an even bigger aquarium.
PEOCOCK AND HAPS - Malawi Peacocks, Electric Blue Haps, Yellow Peacocks, Jacobfreibergi and other fish that live away from the piles of rocks in Lake Malawi, where the more aggressive Mbuna Cichlids live. Keep a group of at least 12 of fish so the strongest fish not make the weakest fish miserable. These fish will grow fast and need a warm water aquarium with at least 50 gallons. Eventually they will need an aquarium with at least 80 gallons of water. Synodontis Catfish are usually compatible with Peacocks and Haps., but the Mbuna Cichlids, listed above, are not.
INVERTBRATES - Critters. Tadpoles, Fiddler Crabs, Mystery Snails, Crayfish and Ghost Shrimp. These animals do well in either a cool water aquarium or a warm water aquarium. These critters are compatible with many smaller less aggressive fish, except the Crayfish, which are larger, more aggressive, and may bother small fish, but Crayfish are usually compatible with aggressive fish. Puffer Fish love to eat Crabs, Shrimps, and Crayfish, so they are not compatible with these Critters.