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Which iron chelate should I use?

mrtank50

Member
Joined
6 Jan 2021
Messages
47
Location
Türkiye
Hello friends. Which iron chelate should I use?
I have a tank with soft water.

I have csm+b but I can't get full efficiency because the iron form is edta.

Would it be more efficient to mix csm+b with ferrous gluconate or just use ferrous gluconate?

Or is there a brand of fertilizer you recommend?
Seachem iron vs.




Aquarium features:

KH-0/1
GH-5
PH-5.5/6
TDS-100/120
LITER-150
LIGHT-39*6
Soil : ADA AMAZONIA
FERTILIZER- Eİ NPK
 
Joined
20 Dec 2019
Messages
540
Location
South Carolina
Gluconate breaks down really fast and I don’t think it’s absorbed as well in hard water either. If your water is in the higher pH range you’ll want to use DTPA or EDDHA. I’d try the DTPA first.
 

erwin123

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Joined
4 Mar 2021
Messages
872
Location
Singapore

Hi Mr Tank,

You are able to pump 150ppm CO2 in your tank and your PH is 5.5,

There shouldn't be any concern about which Chelate to use - just dose Fe while you are pumping CO2.

Look forward to updated photos of your tank, hows the Pantanal and Senegalensis?

By the way, the recommendation in UKAPS is that if you have many questions, it may be better to have a journal where your questions and problems can be addressed in a holistic manner, instead of posting different threads. For example, in your recent CO2 thread (last week) you said you had Kh4, Gh6, but here you say Kh1 Gh5.... so we don't know if you have multiple tanks and which one you are asking for help on.
 
Last edited:

Hanuman

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4 Jan 2019
Messages
1,367
Location
Thailand
You are able to pump 150ppm CO2 in your tank and your PH is 5.5,
I think the infamous KH/PH/CO2 chart is the source of this belief. I don't believe for a second he has 150ppm of CO2 in his tank.

Also that tank you are referring doesn't seem to be the same tank that is being referred in this thread unless he made some changes and parameters changed.
 

mrtank50

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Thread starter
Joined
6 Jan 2021
Messages
47
Location
Türkiye
Thanks guys for your valuable reply.

I have about 9 tanks.

My tank with 150 ppm co2 is a different tank.

I'm thinking of starting a thread with that tank soon.
 

MichaelJ

Member
Joined
9 Feb 2021
Messages
1,690
Location
Minnesota, USA
Hello friends. Which iron chelate should I use?
I have a tank with soft water.

I have csm+b but I can't get full efficiency because the iron form is edta.

Would it be more efficient to mix csm+b with ferrous gluconate or just use ferrous gluconate?

PH-5.5/6
Hi @mrtank50, With softer water and a pH in that range your fine with EDTA chelates.

Here is a chart showing availability of Fe with various chelates as a function of pH:

1650557334273.png


As you can see at a pH of 5.5-6.0 there are no short term precipitation that would render it unavailable to the plants (we are talking several weeks here). Back when I was running my tanks in the 7.2-7.4 pH range I would supplement with a mid-week dose of Fe Gluconate (Seachem Iron), now that my pH is down in the lower 6 range there is no need for that.

Hope this helps!

Cheers,
Michael
 

plantnoobdude

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17 Mar 2021
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763
Location
uk
well, I used to dose 1ppm Fe weekly from EDTA but still had iron deficiency. this tank was very softwater, ~5gh, 0kh ph never measured but had active substrate so, the ph should be 5 or so.
once I changed that to DTPA at 0.1ppm Fe weekly (same gh) it was just fine, plant tips grew nice and greened up well. 0.05ppm weekly was too low, 0.075ppm was borderline.
 

MichaelJ

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Joined
9 Feb 2021
Messages
1,690
Location
Minnesota, USA
well, I used to dose 1ppm Fe weekly from EDTA but still had iron deficiency. this tank was very softwater, ~5gh, 0kh ph never measured but had active substrate so, the ph should be 5 or so.
once I changed that to DTPA at 0.1ppm Fe weekly (same gh) it was just fine, plant tips grew nice and greened up well. 0.05ppm weekly was too low, 0.075ppm was borderline.
Hi @plantnoobdude, Very interesting observation. I wonder if that could have been induced by something else in combination. In any event, I suppose this could also be plant species related.

Cheers,
Michael
 

plantnoobdude

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17 Mar 2021
Messages
763
Location
uk
Hi @plantnoobdude, Very interesting observation. I wonder if that could have been induced by something else in combination. In any event, I suppose this could also be plant species related.

Cheers,
Michael
well, apart from that the main change was a difference in Fe:Mn ratio. Mn was still much less than what I was dosing with my premade mix.
 

MichaelJ

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Joined
9 Feb 2021
Messages
1,690
Location
Minnesota, USA
before I was dosing 1ppm fe with 0.2-0.3ppm Mn if I remember correctly.
now I am dosing 0.1ppm Fe with 0.067ppm Mn. while the total value is still much less, the ratio is different.
I believe certain plants might have a harder time absorbing Fe EDTA vs. DTPA, but it is also depending on other nutrients as you have experienced. The pH relationship is definitely a factor, but only part of the story as we know. Personally, I never had Fe deficiency in the past with slow growing easy plants in a low-tech environment - regardless of EDTA Fe use and pH level - I was only hedging my bets with Fe Gluconate before encountering any signs of deficiency in the first place.

Cheers,
Michael
 
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