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Rocks to add iron to water?
Will rocks containing iron add any significant iron to a planted tank's water?
I found some rocks I used in my old un-planted tank. The rocks appear to contain some type of iron, they have what looks similar to "rust" staining from minerals in the rock.
I also have some red slate - does it's color derive from iron in the rock?
I would be very careful with rocks leeching "rust" which might well be iron, or copper, or... ? This could poison the fish (and plants too). Iron after all is a heavy metal, and all heavy metals are toxic to all life. Which is why one has to be careful dosing minerals.
I don't believe red slate has any connection to iron, but I will defer to the view of a geologist.
Thanks Byron, I had not even thought about other potential minerals! Better to use that rock in the yard then.
Red slate does get its color from iron, but due to it's structure it's still inert.
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