I have yellow spots on my babies. They are only on the end of the leaves. Ph is fine. I sprayed some fuller spray on them and wondering if it burned them. I never had that problem until after I sprayed them. Will it keep yellowing if I never spray them again. Not to mention the roots are growing through the bottom of the planter. I have a dripper system so they are touching the water and getting dripped on. What is it and what should I be doing different?