Yellow leaf tips that become brittle.

…And cotinuing my prev post. As you’re growing in DWC - the roots may show some symptoms too. Make a new res patch give about 200-250ppm of CalMag for the base then get your EC somewhere between 0.7-1.2 / 350-600ppm.

Foliar symptoms appear as K (Potassium) deficiency. You’re having way too high EC and therefore the excess salts creates nutrient lockouts. Plants may express the symptoms as a deficiency or excess symptoms on the foliage.

It is a nutrient overload problem, not a lighting issue. You are feeding them too many things. They certainly don't need bud candy or terpinator at this stage - they are baby plants, baby plants need baby feeding!

An EC of 2.2 seems high to me, The base nutrient chart says for 2ml/l since your adding everything else in as well you might need to dial back a bit.

always grow with cal mag , especially in hydro. The good news is , you're already doing all the right things, the damaged leafs wont magically recover but the problem should have stopped or should stop within a day or so of spreading . Just look out tomorrow to see if it's at least slowing down, if that's the case, you caught it , which is a good thing. Hope this helps ! 🚀