The article Practical Water Chemistry on this site recommends GH of 9 to 18 for African cichlids. The species profiles for my 3 Malawi species recommend water hardness of "Hard." According to the article Water Hardness and Fish Health, "hard" means GH of 8 to 16. Close enough. So far, so good. But, I was reading the label of Seachem's Cichlid Lake Salt product (see below), and Seachem recommends GH of only 4 to 8 for Malawi cichlids. That's a BIG difference from what the resources on this site recommend. Who is right?
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