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Not to beat a dead horse, but it's pretty near impossible to give Rift Lake cichlids water which is too hard. Many cichlids actually grow faster in pure salt water. I don't know if it's still done, but many years ago Tilapia were being bred and raised in the ocean; they grew faster and larger in pure salt water than fresh. I've observed black blotches on Neolamprologus brichardi (Lake Tanganyikan cichlids) which were kept in tap water. With the addition of salts these blotches disappeared. Waste water is great for Africans. I've also kept plants like Vallisneria in extremely hard water - I had to cut them back as they would reach 7 feet! Very soft water usually killed plants.
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