need help diagnosing this Masterkush, 7 weeks into flower.

Problems seemed to be isolated to one of the plants, but now 2 of my younger ones are getting brown tips on flower leaves, and leaves are yellowing and dying over night. big problems. I think it's bugs. I fed using 2 gallons of water, with a hefty table spoon of mollasses mixed into one of the containers.

could this be a bug issues?

No, sir. Lack of Nitrogen. Textbook example.

thank you very much! is there any remedies you recomend before i end up in home depot again?