Garden Season

I find some yellow tips on leaves in the 00 kush but just in the top leaves, the down part of the plant is all green. I also have an issue with one of the Banzai Punch (the plant in the right up) is losing her green color and making some yellow spots on the leaves maybe is a Mag deficency? I try to give her some Bud candy extra in the week, and I give 1 ml in 1/2 liter water of Sensizym to clean a bit the roots zone, maybe some minerals are crystallized down there and give an excess of nut in the plants.