The reason aquarium owners advise you to keep aquariums tropical fish is because they are tough and hardy and breed easily. The most popular aquariums tropical fish species are Siamese fighting fish, Arowana, Barracuda, Datnioides Tiger Fish, Sword Tails, Guppies and Puffer fish.
Most aquariums tropical fish species require warm water temperatures that range from 75 to 80 degrees F. This is the optimum temperature at which most of these fishes are active and productive. The food for aquariums tropical fish includes floating fish flakes, dried worms, shrimps, small snails and clams. Sometime the bigger fish prey on the smaller fishes also.
The aquariums tropical fish species should be fed at least twice a day, and the extra food should be removed after half an hour with the help of a net.
The number of aquariums tropical fish in an aquarium depends upon the kind of aquarium you have. If you have a small aquarium then it is best to go in for a few fish. This prevents overcrowding of fishes and accumulation of toxins. Also, custom designed aquariums, especially tower aquariums, are quite shallow and do not support the growth of many fishes.
A popular aquariums tropical fish species is Arowana, also known as Dragon fish. The user has a choice to pick from six different species of Arowana. These fishes usually grow to a length of 36 inches and must be kept in large tanks. They are easy to breed and are compatible with Catfish, Cichlids and large Tinfoil Barbs.
Another popular aquariums tiger fish is Barracuda or Ctenolucius hujeta. This is mainly a freshwater fish and is popularly known as the Blunt Nosed Car, Gar Characin or Hujeta Gar. The Silver Tiger Fish and the Black Tiger Fish are two other popular aquariums tropical fish. They are piscivorous in nature and are most active in large aquariums.
Guppies are easy going fish that are available in bright colors while Sword Tails are easy to keep and are compatible with Mollies, Platies, Angels, Corydoras Catfish, Plecostomus, and Bigger Tetras such as Black Skirts, Red Serpaes, and Silver Tips.