It's not the Ferrite or Ferritic oxide that I would be most concerned about but the level of Zinc which formed the galvanized coating, here is an short description of the effect of Zinc in a marine tank:
"Zinc:
Zinc is a necessary element for marine organisms. Zinc concentrations of 0.1ppm to 1 ppm cause lowered growth rates in zooxanthellae. A concentration of 0.1 ppm reduces fertilization in the Faviidae family of corals. Natural levels should be maintained, as it is essential for photosynthesis and for the formation of calcium carbonate by corals.
Some crustaceans can regulate the amount of Zinc intake but at high levels this ability is lost, thereby allowing toxic accumulation. As with many heavy metals, the toxicity of Zinc on invertebrates is increased with decreased salinity.
Maintaining natural levels of Zinc is recommended in your system, which can be achieved through regular water changes using a good quality salt mix."
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