Iron test kits are bad? - The Planted Tank Forum
 
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post #1 of 10 (permalink) Old 11-02-2004, 01:58 AM Thread Starter
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Question Iron test kits are bad?

On http://rexgrigg.com/bow.htm towards the bottm, it says,

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If you buy an iron test kit the only thing your gonna end up measuring is your own stupidity ( I know I bought 2 of them) (Submitted by Greentank)
Explain? I use Seachem's Iron test kit.
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post #2 of 10 (permalink) Old 11-02-2004, 02:04 AM
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I think what Rex is referring to is the dubious honor iron test kits have of being pretty inaccurate for our applications.

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post #3 of 10 (permalink) Old 11-02-2004, 03:24 AM
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That's correct. Iron test kits IMHO are a waste of money.
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post #4 of 10 (permalink) Old 11-02-2004, 02:50 PM
 
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correct, iron test kits can't accurately measure the miniscule amount of iron needed in a planted tank.
do a search and you'll find countless posts "I used my test kit, and had to add 20mL of iron to my 10 gallon tank before it said I had .01ppm...." and the next day they have a thread algae bloom of doom...because they overdosed iron, thanks to their handy test kit.

Besides, iron is a trace. If you add some iron to the tank, you have enough iron.
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post #5 of 10 (permalink) Old 11-03-2004, 06:34 AM Thread Starter
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That's odd....

I did Seachem's Iron test for example. It showed I had no Iron at all. Planted tanks should have between .1 and .2 ppm of Iron. I then added Seachem's Flourish Iron (which is chelated Iron) according to the label, 1 mL per 10 gallons, which should raise Iron by .1 ppm. I waited an hour, did another Iron test, and it showed I had .1 ppm!

I know that there is a difference between free form Iron and chelated Iron. Seachem's test says to wait a full 45 minutes for the color to develop to test for chelated Iron.

Anyway, I guess it works for me!
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post #6 of 10 (permalink) Old 11-03-2004, 10:52 PM
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Quote:
I did Seachem's Iron test for example. It showed I had no Iron at all.
Read all of the above posts!

Mike

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post #7 of 10 (permalink) Old 11-04-2004, 12:10 PM Thread Starter
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Quote:
Originally Posted by Momotaro
Read all of the above posts!

Mike
It showed I had .1 ppm after I dosed?
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post #8 of 10 (permalink) Old 11-04-2004, 10:32 PM
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WHOOPPS! Must have mis-read! My apologies!

I still wouldn't bother with an Iron test kit though.

Mike

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post #9 of 10 (permalink) Old 11-05-2004, 09:05 AM
 
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I've also been reading that Fe test kits are a waste of time. I'd say that it depends on the test kit.

I use JBL's Fe test kits. They react very well to iron levels in the water. When I add Plantex to the tank, the test kit shows the right amount of increase in Fe, matching my calculations. After a 50% water change, the kit shows half the amount of Fe in the tank, as it should.
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post #10 of 10 (permalink) Old 11-05-2004, 02:58 PM
 
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The biggest reason I find it to be a waste of time is because Iron is a trace..you don't need very much. If you dose plantex often, or another chelated iron fert, you shouldn't have to worry about low iron levels. Don't over-dose and you won't have problems.
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