how much iron - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 02-24-2006, 05:57 PM Thread Starter
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how much iron

when i add iron how long do i wait to test the tank water?
how much iron should there be ppm. ?

I got a iron test kit and tested last night and it read 0

any suggestions i added iron last night and this morning i was gonna test again when i get home.

if it still says 0 im gonn add a drop of iron to my testkit to make sure its working.

Dave
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post #2 of 7 (permalink) Old 02-24-2006, 07:24 PM
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I would think in most cases it would depend on your circulation as far as how soon to test after dosing.

Try a search on test kits. Iron test kits have proven very unreliable and most people don't use them.

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post #3 of 7 (permalink) Old 02-24-2006, 09:28 PM
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Good question. I'd like to know the answer, too.

Your test kit is probably working, but probably only measures ferrous iron, not ferric. Ferrous iron is the form most easily used by plants. (or I may have it backwards, sorry). Anyway, the form used by plants is quickly converted to the other form, unless chelated. This means you can add a bunch of the proper form of iron, and get a test kit reading right away, but you'll probably see 0 the next day.

So how much to add? There is the problem. Too much and you'll poison your fish.

Hope someone answers.
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post #4 of 7 (permalink) Old 02-24-2006, 11:42 PM
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thats is a hard one to answer most what ive read is there isnt many good test kits out there for iron i know if i add to much iron algea starts to show up so i dont add much at all
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post #5 of 7 (permalink) Old 02-24-2006, 11:53 PM
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Iron often precipitates out into the substrate leaving it undetected by test kits but bacteria and low ph conditions can make it available again to plants.

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post #6 of 7 (permalink) Old 02-25-2006, 07:34 AM
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Fe testing has a few issues.

Try this: test at t= 5min, 10 min , 30 min and 60 minutes.

Add 1ppm based on the tank volume and the trace concentration.
See what the test kit measures.

I think you'll find things do not last long, it's like adding CO2 for 5 minutes, stopping and then watching it disappear.

You cannot kill your fish or shrimp without dosing 10-20x or more suggested dosings. I've added 200mls of Flourish to a 20 gal tank and left it for 4 days.
No wild SA fish had any issues nor shrimp etc.

That is 40X the max amount you will ever need for a very high light tank.
So..........

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post #7 of 7 (permalink) Old 02-25-2006, 08:15 AM
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Quote:
Originally Posted by plantbrain

That is 40X the max amount you will ever need for a very high light tank.
So..........

Regards,
Tom Barr
So from what you said, it seems you could/should does Fe all day (say by drip method) and it should be used up with no problems.

I guess then dosing Fe every day is a good idea.
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