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It prevents calcium crystals from propagating which might be unattractive to additional calcium and carbonate ions. Magnesium is important to maintain appropriate levels of alkalinity and calcium.
Royale Cray Supplement for Crayfish - CF3 Magnesium
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Royale Cray Specialist West Coast
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Aquarium Fishes, Tanks & Supplies From Royale Cray Specialist West Coast
