The Planted Tank Forum - View Single Post - Is there freshwater tests for iron, magnesium, and calcium?
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post #6 of (permalink) Old 12-24-2012, 10:06 PM
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Originally Posted by psalm18.2 View Post
My plants are showing signs of iron deficiency and possibly calcium.
This is more than luikely, CO2 related.

I've never seen a Ca++ deficient aquatic plant in 20+ years.
The only way one might do that is having plain sand, inert.....and RO water.....and not dose Ca++ at all... for sometime.

It's possible, but exceedingly rare.

If you ever feel something is deficient, add more, a very simple solution to rule out such possibilities. Wait 1-3 weeks etc. If nothing improves, then you know it's something else.

Tom Barr
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