These inhabit various biotopes in tropical and equatorial regions.
Basically they may be divided into two groups. The first comprises those for which soft, acidic conditions are essential. Some require a very low level of hardness, with a typicalpH of around 6. The second group prefers hard, alkaline conditions. For some species the level of hardness must be extremely high, with a pH of up to 8. A few species can survive in brackish water. There are some fish which are not dependent on water quality. These are consequently ideal for the beginner, who can, in principle, fill the aquarium from the household supply.
aquarium from the household supply.
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