is this a magnesium deficiency?

Yeah their in flw week 5. Check out realgrowers on the recharge.
 
Since you are troubleshooting I suggest you do one thing at a time. You said you were going to first flush and then add nutes. I would follow lab's advice instead and just do a flush til runoff matches what you put in, then wait til soil is dry again, then do another analysis.
 
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How do the buds look if your in week 5 flower?

their are forming up.
 
Those look beautiful bro. I am not sure you have a ton of time to correct any deficiencies at this point in flower.

I would say a top dressing of worm castings or some fresh potting soil would be just what your plant would need to finish to its fullest potential.
 
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Well not really sure what may have been the cause of the deficiency but here we are coming along and ready to come down in 3 days
 
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