Adding iron...

You can use Seachems Flourish as a balanced micro-mix which contains iron. Or if you want to target iron exclusively, Flourish Iron should work. At the recommended dosing it should be safe for shrimp.

CSM-B is another micro mix with iron, a powder you can mix with water to get a solution to dose. You can also get various iron chelates (chelators like EDTA or DTPA) as powdery substances. Again, toxicity comes with the amount used.

Option said:

I'm going to start adding liquid iron to my tanks. Any suggestions on which kind? (seachem?) How often do you add it - weekly?
Also, is it safe to assume that it's safe for shrimp tanks?

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To pay for college, way back in the dark ages, I worked as a clean up laborer in a steel mill. I got to watch liquid iron being poured from a blast furnace into railroad car "bottles" for transfer to the steel furnaces to be turned into steel. Huge quantities of liquid iron is truly an amazing sight.