Leave curling down

While drooping leaves are often related to a plant's internal water pressure (turgor pressure), it is not always the only or primary cause. But I don't see any nutrient symptoms that would indicate it was nutrient based. Only droop. Plant's leaf position and movement are heavily determined by turgor pressure, this pressure provides the rigidity and structural strength that allows leaves to maintain their position and orientation. Turgor pressure is the driving force behind cell expansion and elongation, which determines the final shape and size of a developing leaf and petiole. Turgor pressure is primarily driven by osmosis. Osmosis is the process responsible for the net movement of water into the cell. Osmosis is crucial to the rate of transpiration because it drives the initial uptake of water by the roots and the movement of water into leaf cells to replace the water lost through evaporation. At normal atmospheric CO₂ (around 400 ppm), the optimal LeafSTemp for photosynthesis in most plants is generally between 77°F and 85°F. Transpiration occurs at 3x the rate at 86F as it does at 68F. Airflow also adds transpirational pull. Not enough pressure creates stress, Too much pressure creates stress. Balance.