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Potassium is a key element for marine tanks and is fundamental for stony corals. His concentration should be between 380 and 450 mg/l with an optimum of 400 mg/l, the value we find in natural salt water. As for many other elements, potassium is used in both coral skeleton and cellular processes, furthermore it is used by zooxantellae for which it is a fertilizer, like common vegetal cells.

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