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[APD] Re: Chelators
>> Sounds much more like some other problem than poor iron, Mg could have
>> been the issue.GH could have changed in the tap etc, I've never associated
>> a low Trace iron level with BGA. I've had RFUG's for 10 years with plants.
>Hmmm, the tank is filled with well water that has very low KH and GH, so it
>is supplemented with pulverised dolomite. Annual water tests done by the
>local health department show no change in GH, and neither do my more frequent,
>but more crude, home tests.
Annual test? Hehe..........
Generally the home test are okay for GH though.....
>> I've had RFUG's for 10 years with plants.
>Were you using Fe-gluconate or Fe-EDTA?
I've used both and DTPH(Tropica)
Some very subtle differences and mainly Cu I believe rather than Fe chelator.
>>> Would Fe-gluconate be oxidized morerapidly than Fe-EDTA in the
>>> oxygen/bacteria-rich substrate of an undergravel filter?
>>I would not think it would matter as far as the plants are concerned.
>Well, then I'm baffled. The only change I have made was to switch the
>Fluorish with Fe-EDTA (whatever brand is cheapest at the time).
Any particular species of plant that was effected and some that were not?
What type of substrate also?
>continued dosing with KNO3, Flourish phosphorus, and Flourish Trace.
>I initially switched to a product that has Fe and K, but not Mg, so I
>don't think I can attribute the problems to Mg deficiency. The improvement
>was so rapid that I am convinced of the causal link. I just don't know WHY.
If it was rapid, then this sort of says that it was not traces, but rather something else.
Traces take a while to show up in plant health, I give them 3 weeks vs one week for macros before deciding.
You can see PO4 differences in less than hour if there is strong limitation.
>Oh well, the tank looks pretty good now, so I guess I won't worry
Well, if you are happy, stick with it.
Go back later if you are really curious and try to reproduce it for the reasons/assumptions you believe to be true.
See if they are, then decide.
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