Is this a magnesium deficiency? (Pics)

[UberNuggets]

Hello all, would appreciate any insight into what this may be. Noob grower here. I've searched the archives and feel that magnesium deficiency is the problem, but was hoping for confirmation.

Plants are 5-6 week old clones, still in veg under a 1000w hortilux wide spectrum hps.
medium is soilless mix. Plants were transplanted from 1gal pots to 5gal pots 5 days ago. Promix+perlite+Marine Cuisine 10-7-7 fert (1 tsp per gal of soil).



Should I add lime? Plants were just heavily watered 5 days ago since they were transplanted. At the suggestion of a friend I picked up some Cal Mag + and have been applying it via foliar feeding 3x daily for the past 2.5 days. Have not noticed any significant change yet.

 

[UberNuggets]

 

[SeaMaiden]

No. I think it's a K-. All affected leaves are mid-plant, showing spotty necrosis. You also appear to have a slight P- going, gauging by the reddened petioles.

 

[UberNuggets]

No. I think it's a K-. All affected leaves are mid-plant, showing spotty necrosis. You also appear to have a slight P- going, gauging by the reddened petioles.

Any recommendations to resolve this? Or should I just wait for the roots to hit the new ferts that are already available from the transplant 5 days ago? Thanks!

 

[SeaMaiden]

I would wait to see how it performs post-transplant. Anything necrotic won't come back.