OMG HELP CANT FIGURE OUT ISSUE

MR. GiggleShitz said:

Canna washes and pre buffers their coco.
Adding Ca and Mg continues to buffer the coco.
I don't PH my nutes as my coco controls the PH in ideal range.

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Did not know that. Thanks.

UPDATE
Whatever was done worked. But now I need more help. Is anything wrong ? Some leaves have brown spots. The big one also looks too big for pot... time to repot?