In 1842, Dr. Johnston introduced his first glass aquarium but the glass is only in the front side. This aquarium capacity of 20 liters and its filled with sea water.
Discovery still continues, in 1850 freshwater aquarium with a larger size (50 liters) was introduced. The aquarium contains Goldfish, a water plant species Vallisneria gigantean and some snails.
At that time, marine aquarium is more popular than freshwater aquarium. Difficulty of finding freshwater ornamental fishes (except goldfish) - while the marine ornamental fish was having more attractive color and more vary - making marine fish tank more popular.
The First Maanvis Picture
The first painting of Maanvis fish (Pterophyllum scalare) made by Alfred Russel Wallace (1823 � 1913). He saw this fish on trip to Rio Negro, Brazil in 1850s.
