New Fish Tank Tips: Don’t follow the 1 inch of fish per 1 gallon of water rule. A better guide would probably be 1 inch of fish per 2 or 3 gallons of water. Use the future adult size of your fish when computing how many fish you can keep. Resist the temptation to overcrowd your tank. The more tropical fish you have the more often you will have to perform fish tank maintenance.
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The Indian glassy fish, Parambassis ranga, is a species of freshwater fish in the Asiatic glassfish family (family Ambassidae) of order Perciformes. It is native to an area of south Asia from Pakistan to Malaysia.
It occurs in standing water, especially in impoundments, and it breeds prolifically during the rainy season. The species feeds on crustaceans, annelid worms, and other invertebrates. It is in turn prey for larger fish, including snakeheads (family Channidae).
The Indian glassy fish is not important as a food fish for humans, but is very common in the aquarium trade.
Formerly classified as Chanda ranga, the species is also known as the Indian glassfish, Indian glass perch, and Siamese glassfish.
Glassfish have been kept in aquarium for many years, but have a reputation for being delicate and difficult to keep. This may be related to a persistent myth that these fish need brackish water. In the wild they more commonly inhabit freshwater, and in captivity do well in slightly soft to moderately hard dGH 7 – 19, slightly acidic to slightly alkaline water pH 6.5 – 7.5. They can tolerate a temperature range of 20 – 30 °C (68 – 86 °F) 
These fish can be shy when kept in too small a group (fewer than five individuals) but when more fish are kept, they become bold and outgoing, making interesting additions to the community tank. They prefer to swim at the middle and lower levels of the tank, and will take most small live and frozen foods. In general, they tend not to eat dried foods (such as flake) .