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See, that's the difference. Your P levels being 3+, mine being one tenth of that. You adding 10ml Iron, me adding 1ml Iron.
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But think about it:
Your P is 1/10th of mine. You are adding 1/10th the amount of Iron. Your ratio of 1:10 is the same as mine. The difference is that You may not have sufficient precipitation (in absolute quantity) to
See it with your eyes. It doesn't mean that its not occuring--just that its not producing enough white cloud for you to notice or see. Additionally, Your tank is roughly twice the volume of water of mine, but the P/Fe ratio is still 1:10.
Because I am adding 10x as much to half the volume of water--I can see it from the front of the tank and from the side view.
You may still be getting a huge amount of preicipitation--in reference to the absolute amount of P vs Fe. The P may even be precipitating 100% of the Fe--who knows?
We are still at the point where we don't know enough to really debate it. And I don't forsee me having the time to research it in the near future. BUT I think this shows/indicates that the Iron we add
Will be precipitated by the P that is already in the tank, in whatever form it is. How much?--I don't know. Does P have a Max precipative limit?-I don't know.
There's just too many details about this that I am unaware of.....
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Interestingly, after all my vehement attacking of your theory I changed my autodosing from two bottles (micros and macros) to one bottle (everything except P). LOL!
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That's Good! The only problem that I am aware of is with P. Everything else gets along fine--from what I have learned/understand. You may just end up needing to add more Iron to Your daily dosing in order to overcome any P precipitation. If You show up with what appears to be an Iron deficiency--then just add more Iron to Your auto-doser.
From what I've seen: it
Appears that P has a Max precipitation limit--I don't know this: I'm just putting 2+2 together from what I have seen....
Edit: This may vary well be incorrect because of the various possible reasons listed below for the reduction in P: See Edit Note.
Edit Note: It was bothering me whether my P was +3 or +0.3, so I looked at the test scale and it was definitely +3. While I had it out I glanced at the instructions and remembered that P is a quick simple test--so I went ahead and did it. The results are: 0.1-0.15. The reduction in P is no doubt from the water change and a reduction in feeding--both quantity and frequency. But the question to me remains: Does P precipitating Fe cause any reduction in P? I guess I can kind of check that out over time by doing back to back tests--before and after adding iron.
I guess the reduction in P could also be caused by the Increase in everything else as I am dosing more.....Plants using more P.
Edit Note 2: The 1:10 ratio of P/Fe above is incorrect. The ratio of P/Fe is actually about 30:1. The ratio between My setup and Wasserpest's is 1:10. I have left it the way it is simply because it reads well for getting the point across....
HTH