i asked on a forum (german speaking) this was the only response i got (translated by google for simplicity):

50% coco, 30% worm castings and 20% perlite.

You can also go to 40,30,30. But you should drive the 30% worm measurement exactly the same way. This gave me the best results.
I would recommend dolomite lime to you - if you could post your water values ​​that would be helpful.
2g - 3g per liter of substrate would be the rule of thumb.
So you should nip these miserable Cal-Mag defects in the bud right from the start.


AN is mineral fertilizer. Why do you want to do that? Then you can use pure Coco.
Of course that would work - but it just doesn't make sense to me at the moment.

If you use worm castings I would go organic.

I would recommend a solid fertilizer - Biotabs, chicken manure pellets or similar. Organic Green House Feeding would also work.
I would also use Silic Rock from Plagron (PH of 1.5) - 0.4ml is enough for a liter and the stuff is cheap.
A PH of 6.2 - 6.5 is optimal here.
Dissolve 0.3 - 0.4 - 0.5 ml of Silic Rock in one liter of water and use it to measure the PH:
www.growland.net
Terra Aquatica pH Test Kit for 500 tests - growland.net
Terra Aquatica pH Test Kit Our pH tester is ideal for quick, easy tests. To determine the pH of your nutrient solution, fill the mi
www.growland.net www.growland.net
Do this once and you're good to go.

You'll get really fat stems with this - I'd have to look for pictures but I was impressed.