Magnesium deficiency week 3-4 flower?

I am guessing this to be a mag deficiency, but would like to be certain before treating. Strains are Holy Grail Kush, Kandy Kush, and Euforia. I am in 5 gal buckets with soil that was recycled and reamended with rabbit poo bedding mix composted roughly 2 months into the soil prior to planting, Garden Tone was ammended into the soil prior to transplanting into 5 gal buckets from 1 gal pots. Vegged from seed roughly 8 weeks under 8 bulb 4' T5 until placed under 1000w HPS Oct. 4th. Plants are about 2'-2 1/2' wide and about 18"-24" tall. Transplanted into 5 gal buckets and added 2/3 cup Garden Tone on 9-11. Gave a banana peel tea around Oct. 6th. The big fan leaves on 1 Kandy girl went yellow all the way up and down the stalk. I top dressed again with 2/3 c Garden Tone and 1/4 c EWC on Tuesday working this into the top 1" or so of soil. My assumption is the K from the tea caused the mg to depleat quickly causing a def. Should I water with a tsp per gal water to give them a boost? Also, was going to reapply another banana peel and EWC aerated tea next week since I am only week 3-4 on most. The 1st pic is of the lightest one in color. Leaves began to droop like she was underwatered, then lightened in color. After the topdress color began to improve, but the leaves began to curl up at the tips. Then yesterday after a water the leaves began to fold like a canoe. Thanks in advance for any advice or input.

Signs of heat stress, I can't really see your bottom leaves very well so hard to confirm mag def. But your tops look good so you got some type of mobile nutrient issue.