Once more about soft vs. hard water and Ca:Mg ratios - Page 3 - Fertilizing - Aquatic Plant Central

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Old 12-12-2007, 02:04 PM   #21 (permalink)
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Default Re: Once more about soft vs. hard water and Ca:Mg ratios

Ok here is a very good option for K measurment I have here and I am very happy with it:
http://hannainst.com/usa/prods2.cfm?...0&id=009001001
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Old 12-12-2007, 10:10 PM   #22 (permalink)
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Default Re: Once more about soft vs. hard water and Ca:Mg ratios

Thanks Kekon, our new investigating plant guru brain =) You summerize the experience that me including some softwater guys in Sweden have found out (thanks to your earlier hint of low NO3:s).

I myself have 2-3 KH and GH. If I dose more than 10 ppm NO3 each week A. reineckii, L. glandulosa and L. arcuata curls up. M. umbrosum just stops growing.

Now I'm in a state where P. helferi are showing white new growth and it seemed more Fe helped, but thanks for the heads up with the Mg!
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Old 01-30-2008, 09:53 PM   #23 (permalink)
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Default Re: Once more about soft vs. hard water and Ca:Mg ratios

Just thought I'd drop in and give an update following my statement earlier in the thread...

Quote:
Originally Posted by Grubs View Post
Based on your observations - I'm going to try increasing Mg for a bit and see if my Rotalas respond.
My Rotala occultiflora and Rotala mexicana have shown dramatic improvements since I increased Mg. Leaves are on R. occultiflora are 2 to 3 times the length they were previously and much straighter. R. mexicana was close to extinction with just a few green buds on rotting stems but now I am nursing 10 or so leafy stems around 6 inches high. R. rotundifolia is also growing strong.

KH=1
GH=4
NO3 ~= 5 ppm
PO4 ~= 1 ppm

I dont measure Ca or Mg but I mix my own hardness booster (GH and KH from the tap is < 1) and now I added a little more Mg (keeping Ca the same) to bring the Ca:Mg ratio up from 4:1 to more like 2.5:1.

Thanks kekon
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Old 01-30-2008, 10:57 PM   #24 (permalink)
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Default Re: Once more about soft vs. hard water and Ca:Mg ratios

Hi Grubs,

It's nice to hear that it helped your plants. It confirmes my obseravations concerning Mg at low GH.
Now i have total mess in my tank (which is the price i pay for experimenting). I've done something wrong but i can't find the cause. There is 30 ppm Ca and 17 ppm Mg (!!!) and plants are exceptionally pale despite good Fe and micros fertilization. On the other hand no deformations or curling on leaves appear despite so high Mg level ! (the situation was the same when Mg was 8 ppm).
I don't know what's going on
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