Has the Blue Dream gone yellow??

Hey guys I hate to cut in on like this but I am new to this forum and have no clue how to start a new topic.
I have some Blue dream in the 6th week of flower and my leaves are turning all yellow on the edges and have yellow spos on them and I have no clue what is doing it
I'm in coco using Canna nutes a & b + boost at the recomended doses.
Can anyone help me out and tell me what is doing this to my babes, the buds are still in full grow mode and are bending all the stems over but these dam yellowing shit has got me a little worried.

Here is a link to the pics of them. Photo and image hosting, free photo galleries, photo editing

It's normal for this plant to go yellow when it is almost done. 6 weeks of flower? It's done. They don't stay green all the way through flowering; they will go yellow. Nothing to worry about. There are no pics on that webpage. Time for harvest.

Yut, no photos to see there. It's better to have some yellowing and leaf dropping than bright green and no leaf dropping at this stage.