Aquarium guide
Aquarium guide     

  
 
DIFFERENT TYPES OF AQUARIUM
 

DIFFERENT TYPES OF AQUARIUM

An aquarium is not just a motley collection of plants and fish. Some aquarists aim to reconstruct the biotope of a specific geographical region (Central America, the Amazon, Asia, Africa), while others concentrate on a single group of fish (for example, livebearers, Cichlids, or marine fish). Whatever the option, an aquarium must be attractive and wellbalanced for its occupants to thrive, and this entails some understanding of the various habitats, as well as their inhabitants.

Community tank

Community tank.

An aquarium is a collection of elements - fish, plants, soil, rocks, water - which are compatible with each other. However, there are several types of aquarium, all sharing the same general principles and techniques but differing with respect to the environment created. Aquariums are divided into two main groups:

  • temperate aquariums, often mistakenly called cold water aquariums, where the water temperature can range from 5 to 25°C;
  • tropical aquariums, with either fresh or sea water. These cover the areas lying roughly between the tropic of Cancer, to the north of the equator, and the tropic of Capricorn, to the south, where the water temperature varies by only a few degrees throughout the whole year.

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БРЭГГА - ВУЛЬФА УСЛОВИЕ дифракции рентгеновских лучей в кристалле: 2dsin ?? = m? , где d - расстояние между отражающими кристаллографическими плоскостями, ? - угол между падающим лучом и отражающей плоскостью, ? - длина волны излучения, m - целое положительное число. Установлено в 1913 У. Л. Брэггом и независимо Г. В. Вульфом. Брэгга-Вульфа условие - основа рентгеновского структурного анализа.