Diesel Automatic Outdoor

-Started to add a little bit of Calmag Plus. Out of my first 4 grows in coco, I'm beginning to think that adding calmag and iron the sooner, the better. Out of 4 different strains and three different phenos of one strain, every plant has shown some inner yellowing by the second or third week which makes me believe that I am super deficient in iron and maybe some other things. I usually waited until at least 14 days or so to start adding nutes, but by then I already saw some deficiencies..even at bringing down the ph to 5.6 at times instead of 5.8.. so now I think I'll go a little heavier on the calmag earlier to see if it makes a difference. I always flushed the Canna coco before I used it. Maybe not enough, I don't know.