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Re: Aquatic Plants Digest V1 #140
Booth Karla <BOOTHK at PARAVAX_COM> wrote:
>Just because Keith is using Dupla stuff doesn't guarantee that nutrient
>deficiency is not the problem. Keith gave us the sick looking plants in
>March and the new leaves for the next few weeks looked healthy. I had
>trimmed off all the old sick leaves at that point. Then, when we were
>running low on Dupla tabs and going on vacation I started dosing at half
>the usual strength for the month of May. In June, I resumed using about
>a 2/3 dose of what Dupla recommmends (our usual). This past weekend when
>I thoroughly cleaned the 85 gallon tank I pulled up the E. horemanii to
>rearrange. I noticed good leaves (the April growth), some sick leaves
>(the May growth) and some healthy new leaves (the June growth). I would
>question Keith about the amount of Dupla tablets and drops he uses and
>the regularity of application. I would not assume the problems seen are
>necessarily due to substrate because at this point the plantlets have
>very insignificant roots and no real rhizome.
Here's my fertilizer regimen:
I add 3 drops of 'Plant24 most days (sometimes I forget or am too busy
or lazy). I do a 15 gallon water change every 1-2 weeks and add 1
'Plant tablet at that time. These are the 50l sized tablets. The
tank is a 50 breeder. The total system water content is 45 gallons
+/- a couple gal. depending upon the water level in the sump.
I don't suspect trace element (the drops) deficiency because I went
through a period of adding increased amounts of them, 5 drops daily,
for a while to see if it would cure the leaves. It didn't. I don't
have an iron test kit so I can't tell you what levels I reached but I
do have the Thread Algae test kit :-) At the elevated drop level I
started getting thread algae, something normally not present in the
tank. Upon reducing the drops back to 3/day the algae went away
within a week. It's common wisdom, initiated by the Booths I believe,
that onset of thread algae implies excess iron. And to a 1st order
approximation I'm assuming exess iron means excess of the other trace
elements too. I haven't tried boosting the tablet dose.
In case it matters, the carbonate chemistry in this tank is,
GH = 75 mg/l (using Hach kit)
pH = 7.0 +/- .1 (using LaMotte kit)
KH is roughly half the GH (Tetra alk kit)
CO2 is around 9 ppm (I run it lowish on purpose to reduce growth; I
already have to prune more than I like) (LaMotte kit)
I use 1/3 tap water and 2/3 RO water at change time. The actual
numbers fluxuate a bit depending upon current tap conditions. I don't
have a nitrate or phosphate kit but keep threatening to get them Real
Soon Now...
Keith Rogers
krogers at es_com