Brown spots on my plant

[Hitemup]

Hello fellow growers. It's my 2nd grow, wasn't without problems but turned up okey. Until today,when I've noticed brown spots on many leafs.
Like 10 or more. I did Google search before and it seems like calcium deficiency. But I can't be sure. And you have helped me couple of times before. I made some nice pictures , so you can see your self. Let me know please what do you think.
Strain is Incredible Bulk from Dr. Kipling - autoflower
8 weeks old, Coco with perlite

 

[Teddybrae]

Looks like Ca shortage. Lotsa ways to fix it. Read these pages. I 'd sprinkle Dolomite very lightly on the 'soil' and water it in. Sprinkle like sugar on a donut.

 

[Hitemup]

Thank you for the advice ��. Now I can get her right stuff.