As far as your pH is concerned, I am using limestone rocks in my tank to help maintain pH. (I am also setting up a Malawi tank). Every recource I have found indicates this is a natural way to buffer and maintain a pH adequate for Malawis. 
As far as your pH is concerned, I am using limestone rocks in my tank to help maintain pH. (I am also setting up a Malawi tank). Every recource I have found indicates this is a natural way to buffer and maintain a pH adequate for Malawis.![]()