Athosanswered grow question 4 years ago Unless your water EC is below 0.4 or 0.5 EC then it's almost impossible to get mg deficiency. You've been having an ongoing overfeeding problem. With those pots you do not need any additional nutes for quite some time. Stop feeding, give it plain water and let them recover, add nutes once the plant depletes the nutes in the soil, you will notice.