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Often you have an idea of which fish species you would like to keep. Let’s take as an example the angel fish. It can become 20 cm high and therefore needs a large and especially a high aquarium. Although not being a pronounced fish predator, it will, through its sheer size, regard tiny fish and shrimps as food, latest when it is fully grown. Small fish and shrimps are therefore unsuitable companions for it. It doesn’t eat plants and doesn’t dig. So you are totally free in your choice of substrates and plants. It likes to be between roots (biotope descriptions about its habitat) and needs to be kept in a small group. It feels comfortable in slightly acidic and soft water. This all rules out fish which prefer high pH values and harder water. This also would include the East African cichlids from Lake Malawi and Lake Tanganyika, which may otherwise have appealed to you. These, however, like a lot of stones in their habitat.
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