What size should an aquarium for discus fish be?

Large fish need a large enough tank. Size of the aquarium for discus plays an important role for two main reasons – first reason is that, like most cichlids, discus are territorial fish. In an aquarium large enough, each adult discus (or matched pair) has more or less constant territory and tries to defend it against other fish, even stronger than them, which can be easily observed during feeding.

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