Hi there, i have to disagree with folks here : it's from the feeding but it's not from the nutrients . It's actually from the alg-a-mic , which does raise the pH quite a bit. See you're seeing micronutrient symptoms but there's no reason for that to be the case. What happened is the alg a mic raises the pH , causes a fluctuation becausee the beneficial bacteria try to buffer it , then the pH swings and the plant cant absorb it's micro nutrients temperarily. Remember to pH down if you use alg a mic and you'll be fine. To make sure the problem stops spreading stop using alg a mic , and you'll see it's actually already fine as it is. Just a symptom from a temporary pH fluctuation. Hope this helps ! đ