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> After adjusting my nutrient levels (mainly K- two tsp K2SO4 for about 75
> gallons of water to bring K up to about 22 ppm, but also trace and a
> KNO3 to get NO3 above 5 ppm (target 7 ppm)- CO2 was already in line)- my
> plants started pearling for a couple of days, then - they have been
> languishing since then- my hygrophylla is sending out very thin and tall
> light green leaves rotalla and bacopa growth is slow but normal. New
> on my swords are also light green. Does anyone know what may be going on.
"You used up the NO3 and traces, add more and test to see the levels before
and after 2-3 day periods. It does seem like the tail-chasing-the-dog at
times. You run from one to other nutrient. But NO3 and PO4 are the big ones
to watch. Add the traces at least 2x a week, I do 3x weekly for traces,
KNO3, PO4. K2SO4 weekly, water changes weekly. That's it. Your tank does
sound like it gets NO3 limited fast. I'd add 1/2 teaspoon 3x a week of KNO3
and some source of PO4 2-3x a week also".
NO3 have never been below about 4 ppm (last few months)
I would suspect this also, but plant growth is distorted and NO3 is about 7
ppm (measured with a Aquarium Pharm. kit). PO4- is a little less than 1 ppm
(Hagen test kit) and I just added 10 mL of TMG on Thursday when I did a 20%
change as well as another 5 mL. on Sun.
> suspect that the plants may have been used to low K (2 ppm my tapwater),
> may be a bit shocked by the new much higher concentration.
I should have also said growth was distorted- the edges of the hygrophylla
are long thin and the edges are cupped. Can low NO3, PO4 or Trace cause
distorted growth? I thought this is normally a symptom of low Ca++/Mg++. I
have read in a couple of places that if K+ is too high then Ca and Mg uptake
can get out of line.- I wish I had a digital camera. . . Are my test kits
measuring somthing that is not there- I tried my NO3 kit on tapwater with a
result of 0 ppm. The other kits have to sit much longer than the recomended
developing times to get the results I use (typically 1/2 hour (cf. five
minutes) for the phosphate kit and 2-3 hour (cf. 1/2 hour for the iron kit)
Tom, any other thoughts- and thanks for your quick replies!
Cory and Susanne Williamson
7800 Thompson Drive
Prince George, BC V2N 5N5
E-mail: cswilliamson at telus_net