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I also have the severe stunting/crinkling of new A. reineckii-leaves from time to time. If it grows in the shade (light limitation) or I limit phosphate it grows fine.

High PAR/PUR 10000K triphosphour bulbs that are heavy on the blue and red (Triton, Aquastar, Aquarelle etc) often seems to grow plants "too fast for calcium-uptake" with good N, P, K and CO2-levels, especially close to the light.

The same i true for apples - you must not ferilize apple trees with ammonium in sunny weather because calcium-uptake will not be sufficiently fast. The apples will get "bitter-pit". The fast nitrogen source will speed up the growth to fast for calcium uptake.

Calcium can only be taken up via diffusion, the plants doesn't go for Calcium actively as other nutrients. I have seen reports of greater success with A. reineckii with better circulation, which would be explained that the Calcium uptake is passive via diffusion.

I would love to see an A. reineckii grown under very intense 10K light fertilized with EI and insane amounts of CO2 in soft water with an inert substrate. (Calcium uptake is also in the root tips).

A more lean approach like PPS would probably result in greater success, but that is not for me personally. I like EI and will go down with it. I will further seek the easy solution to this problem until I can do EI successfully without Ca-deficiencies and good unlimiting light/nutrient levels.

A good substrate instead of my inert gravel I would guess would help alot. Since ADA-substrates are to expensive to ship to Sweden my next setups will probably use Kitty-litter combined with Akadama... And really good circulation everywhere in the tank without dead spots...
 

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High Ca-concentration wouldn't do anything if you drive the growth rate faster than the plant can diffuse Ca in and transport it to the right place. Add a bunch of antagonistic relations between alkali elements and Aluminium and it seems Calcium is a quite tricky component when the plants are driven very hard.
 
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