JBL ProAquaTest Mg-Ca Magnesium-CalciumSimple and reliable monitoring of the aquarium water values. Determines the ideal magnesium and calcium value for vigorous and healthy growth in corals and calciferous red algae. Easy to use: first carry out the calcium test, then the magnesium test; subtract the result of the calcium test from the result of the magnesium test the result gives you the magnesium content. Reach: the number of measurements depends on the level of the calcium and
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