Why Alternate trace/macro's? - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 03-24-2006, 11:16 AM Thread Starter
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Why Alternate trace/macro's?

In browsing fertilizer threads, it's apparent that alternating the addition of trace elements to macro's is the preferred method. On the other hand, in maintaining reef aquaria, as well as in nature, a constant level of water conditions is the norm.

So thus the question.....Why not add all the materials daily? (or maybe spaced 1 hour apart). What actually happens that has caused the mindset of "alternating days"? It would appear to me that if dry fert's are added at 8 a.m. on day #1, there's a concentration curve that bottoms out 2 days later, when they're added again. It would seem more beneficial to the plants (and possibly the fish) to have that concentration level be constant.

"tanksalot"
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post #2 of 6 (permalink) Old 03-24-2006, 12:39 PM
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I can't recall the specifics, but adding them together causes some of the trace elements to bond with some of the macros and thus they become unavailable to the plants. A thread a while back talked about macros in the AM and micros in the PM. You could do this daily, but them you're up to dosing 14x per week, rather than 7x (or 12x and 6x depending on you method the day of WC).

I think many just find it easier to do something at the same time each day, so alternating keeps it fairly simple.
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post #3 of 6 (permalink) Old 03-27-2006, 01:38 PM
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Quote:
Originally Posted by tanksalot
In browsing fertilizer threads, it's apparent that alternating the addition of trace elements to macro's is the preferred method. On the other hand, in maintaining reef aquaria, as well as in nature, a constant level of water conditions is the norm.

So thus the question.....Why not add all the materials daily? (or maybe spaced 1 hour apart). What actually happens that has caused the mindset of "alternating days"? It would appear to me that if dry fert's are added at 8 a.m. on day #1, there's a concentration curve that bottoms out 2 days later, when they're added again. It would seem more beneficial to the plants (and possibly the fish) to have that concentration level be constant.

"tanksalot"
I think the iron reacts with the KH2PO4 and precipitates out.. but I could be wrong on that.

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Barry
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post #4 of 6 (permalink) Old 03-27-2006, 06:07 PM
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The iron will react with the phosphates and precipitate out.

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post #5 of 6 (permalink) Old 03-27-2006, 06:16 PM
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Thanks for the specifics, folks! Now if I can just remember them ...
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post #6 of 6 (permalink) Old 03-27-2006, 08:14 PM
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Some of us doing Auto-dosing are now dosing everything, everyday, including Excel, and Except for P.

P generally doesn't need to be added much, so it doesn't hamper the overall benefit of Auto-dosing.


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