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Iron is of no importance in ﬁsh only aquaria; however, iron over 0.5 mg/L may be toxic to some species and should be avoided. Under normal conditions, iron is virtually impossible to maintain at measurable concentrations in seawater. Natural seawater concentration for iron is about 0.01 mg/L. Iron is important in planted aquaria and should be maintained between 0.1 to 0.2 mg/L.
MultiTest™ Iron measures both ionic and most chelated iron in freshwater or marine water to less than 0.05 mg/L. It performs over 75 tests and contains a reference sample for validation.