Dry dosing: Mixing macros and micros - The Planted Tank Forum
 
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post #1 of 8 (permalink) Old 02-23-2008, 06:39 AM Thread Starter
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Dry dosing: Mixing macros and micros

Is there a problem with dosing dry macro ferts and CSM+B at the same time? How about storing them together? I was looking over the thread regarding dry autodosing with a feeder and it got me thinking.

Also, would there be a problem if food was stored with ferts?

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post #2 of 8 (permalink) Old 02-23-2008, 03:47 PM
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I believe that phosphate will cause iron to precipitate. I would avoid dosing both on the same day.
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post #3 of 8 (permalink) Old 02-23-2008, 07:57 PM
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They can be dosed on the same day without issue, there is quite a big difference between storing them together and dosing them together. Now, as to storing them together dry, that's a good question. I don't know, I'd be inclined to recommend against it though, but it probably wouldn't be a problem. I would definitely not store the food & ferts together.

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post #4 of 8 (permalink) Old 02-23-2008, 09:34 PM
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Aquarium Fertilizer has PMDD mix - http://www.aquariumfertilizer.com/Store.php
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post #5 of 8 (permalink) Old 02-23-2008, 09:37 PM
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PMDD doesn't contain PO4, thus the issue with mixing PO4 & Fe doesn't apply anyway.

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post #6 of 8 (permalink) Old 02-23-2008, 10:09 PM
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Originally Posted by FrostyNYC View Post
I believe that phosphate will cause iron to precipitate. I would avoid dosing both on the same day.
I have heard this before too. Indiboi and others seem to disagree, though. I don't know what to think, so I just avoid it.
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post #7 of 8 (permalink) Old 02-23-2008, 10:13 PM
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PO4 and Fe will react if stored together, it is not a problem if dosed on the same day. The volume of the aquarium is so much greater and the dose is so much smaller. If small quantities in the aquarium were such a problem, then we'd not be able to dose them at all. It isn't as though your PO4 is zero on the days you dose micros... nor is your Fe level likely to be absolutely zero on days you dose macros. It isn't an instantaneous reaction anyway. PPS and EI 'liquid' both put Micros & Macros in the aquarium on the same day, there really is no problem with doing it that way.

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post #8 of 8 (permalink) Old 02-23-2008, 11:59 PM Thread Starter
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The precipitation reaction does occur, indiboi is not disagreeing with this. However, I am not asking if they will precipitate when I make a premade solution out of them, but rather if there will be a reaction putting the dry ferts together in a container. I am interested in autodosing, and may attempt the dry dose route with a feeder. I would love to use the system indi is using, but I don't have the cash

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