Hello ! So in your case it could be a wind burnt due to the close distance from the fan , but I can't see it blowing directly on the plant In your case it is a slight nitrigene toxicity as your feeding chart is not really a "grow phase" schedule because at that stage you should not mix more FloraGrow Than FloraMicro , the ratio should be the same : same amount of each Your tweaked feeding schedule is leading to slight excess or slight deficiencies You should check the GHE feeding chart and adjust your nutrient level : Hope it will help you 😁👍