thanks for the reply, Rich.

i really really wish that you are right and that this is just the phenotype, but meanwhile is has spread further and many leaves developed dark strips.
the pistils are becoming pink. some parts of the leaves that are not dark are loosing their green. this all thing is movingd down from the more mature buds to the lower ones.
small leaves within the buds has also started to gain dark strips. only thing that is good for now is that all these leaves are still stand normal and not curl down to die. i'll be smarter in a day or two...
anyway, i gave it a good 30 liter flush with adjusted water and finished with a full amount of food according to the scheduale. im thinking there is an option that some of the additivies are bad or react badley with the fertilized soil, so if this will keep worsten up i'll give it another flush whithin 3-4 days and this time hold the food.

wish me luck!