Usually taco leaves indicate inconsistent humidity however given the color of the leaves i feel like there is something else going on there, id start by adjusting the ph down a little somewhere closer to 5.5... im not familiar with the organic willow substrate youre using but i assume its close to coco choir which you ph like hydroponics. And only water with regular ph water no fertilizer. Autos are usually a little more sensitive to nutes and only need 1/3-1/2 strength of normal plants.
Hope this helps, good luck!