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Re: PO4 Deficiency & CO2 Swing

Thomas Barr wrote:
> If you see dramatic pearling after about an hour or so you likely where
> limited.
> Good job with the yeast BTW. It's not easy to keep the CO2 up like that.

The thing is, this is the first time that the CO2 concentration has been
that high and that constant with little output. I used get less than 15 ppm
by the end of the day. One thing I didn't mention was that my NO3 also
climbed pretty high with regular additions, meaning plants were not
consuming it (as fast). When I added that pinch of PO4, the NO3 dropped to 0
in 2-3 days.

> Sure but after you go in and attack all the algae first manually. Then the
> proverbial water change(I like 50%) and then you add your nutrient mix
> in. You can add by estimation easily by doing the 50% water change and
> assuming that there are no nutrients in there besides GH(Ca, Mg).
> Repeat this 3 times over 3 weeks or maybe once or twice extra in between
> refilling your nutrients each time. Don't forget CO2 during this time.
> Try adding a bit more micro's and note the algae response. Try .2ppm then
> try .5ppm. See what you get. Same with the PO4 when you get a kit.Not
> sure an optimal range is for PO4 just not too low or extremely high(above
> 1.5ppm...I guess)

What is the purpose of the 3 water changes and nutrient refills? I was
thinking of just adding PO4 when I see signs of slow growth. Do you think
that a measurable amount of PO4 does more against the algae than an
immeasurable one? Also, is more than 0.1 ppm iron needed in tanks with high
Alex R.
pcalex at yahoo_com