Iron Sulphate

Allwissend

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Until the iron sulphate is added to the calculator, here is some more information

FeSO4*7H2O has 20% Fe . Thus you can use the calculator using EDTA Fe 13% then multiply the amount to be added to create a solution or to reach a certain concentration by 0.65. For example if the calculator says add 1 gram of Fe EDTA ... you should add 1 * 0.65 = 0.65 grams FeSO4*7H2O

Typically in aquarium environments FeSO4 is not stable and will be quickly oxidized. So quick that you can even get deficiencies. That is why most use at least chelated Fe in their micronutrients... at the very least as gluconate, but more common EDTA and DTPA