What my plants need?

Might be a lockout of potassium and calcium due to pH issues. If this plant typically gets 2 liters of water a feed, give it 4 or 6 liters of water. pH your mix to whatever you typically do (I run pH of 6.3). And run your EC at whatever you are keeping it at (Flower I’m 1.6 EC). Give the plant all that water in about 30 min total to let it completely drain out the bottom. Collect all that excess water that came out and your pH and EC should match what you made your nutrient solution to me. If pH doesn’t match your mix, then you know pH was off and you just reset it with all that flushing. If your EC doesn’t match, you know you had a build up of salts (nutrients) and now it should be back to stable after all that flushing. Dr Bugbee says “if you’re mixing up for example 1.2EC then the 10-20% run off should always be 1.2EC or your either feeding too much or too little. “ I hope this helps.