Simochromis diagramma is a species of cichlid endemic to Lake Tanganyika where it prefers murky waters with rock-rubble substrates usually at less than 5 metres (16 ft) and never deeper than 10 metres (33 ft).

It can reach a length of 19.5 centimetres (7.7 in) TL.

It can also be found in the aquarium trade.

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