Those leaves are about to trip the eff out on you. That is a result of over feeding and maybe a temperature problem. Potassium is the element in issue at the moment.
Drop the EC, keep the K and Mag ratios a little higher. Flush the media of salts and balance the pH. Get your temperatures under 80 (75 to 76 is ideal) and keep your humidity somewhere between 30% and 60%.
Give some more info also. My initial assessment is based on very little provided information.
temperature humidity method nutrients media water ventilation pH EC... etc etc.