Deficiancy of WHAT ? - Please help !

Dear fellow growers !

Some of my plants have a problem, but I don' t know what is the exact cause.
First symptoms appeard aorund 10 days ago and they gradually progressed.
My Indica plants do not show any of these symtoms, only the 3 Sativas in the grow do, one of them in a very severe way.
They grow in soil ( the same soil mix as allways) and I use organic nutes (Alga Bloom from Plagron).
The plants are now since 14 days in the 12/12 shedule.
My first guess was : Calcium Deficiancy !
Intested the PH of the water and it is around 8, which is way too high.
But Cal. deficiancy occurs when the PH is too low and not too high.
So maybe I don' t have enough Cal in the soil ?
What else could be the problem ?
Maybe some other kind of micro nutrient that gets lock out due to high PH ?
Or maybe the PH is not s problem, since the soils can puffer even a PH as high as 8 ?
I would be really thankful for any advice, sonce I' m going nuts
I want my babies to feel good and I need a good medicine.
Thank' s in advance,

spicecowboy

Uuups, adding the pictures didn' t work.

So, okay..
I' m gonna give it another try...
I do not know why I can not just normally attach pictures !
wtf ?
I press the attachment button,'but it don' t work !