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Re: Seachem Iron and Phosphate
Kevin Zippel wrote:
> I am playing around with 2 new testing kits, Seachem's iron and
> phosphate (thanks to all who forwarded me instructions for the latter).
> The phosphate indicates that the levels in my tapwater are about 1.5 ppm.
> This seems ridiculously (dangerously?) high. I have a City of Detroit Lab
> Analysis Report from '98 claiming tap water levels of phophorus to be
> 0.29-0.31 mg/L. How do phosphorus concentrations relate to phophate, is
> this excessively high, and what can I do to remove it without using RO to
> strip out everything and then rebuild? Water quality is otherwise
The phosphate level of my tap water is 0.3 ppm. I don't think there's
any danger to humans by consuming phosphate, and it certainly
helps reduce lead levels in the old houses of this area. I use
Seachem's PhosGuard to remove the phosphates from the tank,
keep it in a bag in the canister filter. A cup or so lasts about 1.5
months. This has made all the difference in controlling algae in my
> Regarding iron, is anyone else using the Seachem kit and Homegrown
> Hydroponics Trace Mix for iron? This mix seems to tint the water/reagent
> mix red, making it difficult to interpret the test scale, which works is
> in shades of purple.
I use this kit and Seachem Flourish. I have never been able to read
any iron levels at all. I tend to rely on the amount of algae building
up on the glass to determine whether there is sufficient/excess iron.
> Finally, what is the proper dosage for PMDD? I've seen conflicting
> numbers in the Krib and archives. I know it will vary from application to
> application, but I need ballpark. I've seen everything from a couple
> drops to a couple ml's per 10 gallons per day. Thanks!! Kevin
I really don't think you can generalize. If you have fast-growing
plants, more will be required than if you have a low-light tank of
crypts. Start low and observe the plants and algae levels, slowly
increasing the amount until you notice more algae than usual. Then
cut it back a bit and use that as your maintenance dose. This won't
help you, but here is what I do in my tanks - 30 gal tank with lots of
stem plants and high light: 3-4 ml per day (nitrates always read
zero in this tank - it could probably use more). 40 gal tank with
more rooted plants and moderate light levels: half that dose. This is
very loose, subject to change depending upon how the tank is
doing at any given day. Also, I dose trace elements separately
from the PMDD, using Flourish.