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Hi,

Recently noticed that my plants are having chlorosis hence added EDDHA chelated iron in the water.

It turns the water red. Just wondering is this safe for fish? Also is it safe for us to comsume the fish ?

Any research that shows this is safe? 

thank you

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no problem.  I use it weekly.

see Nate's video

Hi George,

Thank you for your response. Just wondering any research that shows its ok for the fish to be consume after swimming in

water filled with chelated iron as its still chemical.

thank you 

George said:

no problem.  I use it weekly.

see Nate's video

Fe Iron

Chemical?  I don't know.  Don't think so.

Fe-EDDHA is the ultimate option, (if you don't care about the redness) but if you aren't running a pH above 7.5 (and you shouldn't be if you want the best plant growth) you can go cheaper with Fe-DTPA. Dr Rakocy uses Fe-DTPA according to the last paper I read from him.

I lifted this from Sylvia's blog:

"Fe-EDDHA, in contrast, is fully effective up to and even above pH 8.  The problem is that quality Fe-EDDHA is expensive and it turns your water as red as cherry Kool-Aid.

In contrast Fe-DTPA is fully effective all the way up to a pH of 7.5 and it is just slightly more expensive than Fe-EDTA.  This is why Dr. Rakcocy, and other experts recommend Fe-DTPA for aquaponics.  And this is why we have switched to using Fe-DTPA in our AquaIron products."

Here's the post from Sylvia about the different forms of iron you can get and what pH ranges they are effective at:

http://theaquaponicsource.com/2013/08/15/iron-in-aquaponics/

Here are the Nate videos (he does a very good job):

http://www.youtube.com/watch?v=E4_hCAnymFw

http://www.youtube.com/watch?v=qczagOJG5mI

Hi Tim,

Thank you for the info. Well my water is only at PH 7 but have no choice but to use EDDHA as cant locate any DTPA 

around my area as have been searching for almost a month for it. The reason i asked is that just want to know whether

are there any proven research that the redness of the water (color dye of some sort) will not affect the health of the people

that ate the fish. Cause just to me feels more like swimming in chemical water. Yes it is indeed a no choice but have to

supplement the iron as plants really need it. Thanks



Tim Day said:

Fe-EDDHA is the ultimate option, (if you don't care about the redness) but if you aren't running a pH above 7.5 (and you shouldn't be if you want the best plant growth) you can go cheaper with Fe-DTPA. Dr Rakocy uses Fe-DTPA according to the last paper I read from him.

I lifted this from Sylvia's blog:

"Fe-EDDHA, in contrast, is fully effective up to and even above pH 8.  The problem is that quality Fe-EDDHA is expensive and it turns your water as red as cherry Kool-Aid.

In contrast Fe-DTPA is fully effective all the way up to a pH of 7.5 and it is just slightly more expensive than Fe-EDTA.  This is why Dr. Rakcocy, and other experts recommend Fe-DTPA for aquaponics.  And this is why we have switched to using Fe-DTPA in our AquaIron products."

Here's the post from Sylvia about the different forms of iron you can get and what pH ranges they are effective at:

http://theaquaponicsource.com/2013/08/15/iron-in-aquaponics/

Here are the Nate videos (he does a very good job):

http://www.youtube.com/watch?v=E4_hCAnymFw

http://www.youtube.com/watch?v=qczagOJG5mI

You can get DPTA online from the same company that runs this forum, but if you already have a stock of EDDHA definitely use that first, unless the redness is reallly annoying you. Should be fine for the fish though as long as you don't add more than 3ppm.

10 bucks for 8oz DPTA

http://www.theaquaponicstore.com/AquaIron-DTPA-Iron-Chelate-p/agsas...

disclaimer: Yes I work here, but this would be my go to stuff anyway

I've been playing with this iron checker too (Hanna instruments, manufactured in romania) and it's pretty fun and helpful - a good price for what it is but still kinda expensive for a cheapo like myself. I guess the cheap option is to watch for iron deficiency in your plant leaves and treat it as it comes up.

http://www.theaquaponicstore.com/Iron-Checker-HC-p/atshi005.htm

Tim Day said:

You can get DPTA online from the same company that runs this forum, but if you already have a stock of EDDHA definitely use that first, unless the redness is reallly annoying you. Should be fine for the fish though as long as you don't add more than 3ppm.

10 bucks for 8oz DPTA

http://www.theaquaponicstore.com/AquaIron-DTPA-Iron-Chelate-p/agsas...

disclaimer: Yes I work here, but this would be my go to stuff anyway

If you search Iron on this site, there is a lot more info on the various types of chelate.  I  bought $20 worth of EDDHA, a pound, and I expect it to last for a couple of years - 400 gal system - 4 grams or so per week.  It's cheap, really.

Sorry to say so but it is a chemical that have been design specifically to get the iron available to the plant. I am trying to figure out what could be the transformation done to the chelated agent (EDDHA) in the fish organism or by the bacterias in the system. Complex question...

George said:

Fe Iron

Chemical?  I don't know.  Don't think so.

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