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How to raise pH in an African cichlid tank
Cichlids from East Africa’s Great Rift Valley are adapted to hard, alkaline water with a high pH in the wild, and should be given similar water conditions in the aquarium if they are to thrive. Tap water in the UK ranges from about pH 6-8.5 and depends on where you live, and where your local water authority sources its water from.
A pH of 6 is lovely for most South American and West African cichlids but is too low for Malawi and Tanganyika cichlids, which need it above 7.5 and for Tanganyikans, they really prefer a pH over 8. So if you keep Rift Valley cichlids but have tapwater with a low pH, you need to raise it.