Shagrathanswered grow question 4 years ago Hi!
That looks like pH swings or pH problems on general. Have you measured and adjusted your waters correctly and also checked run off waters pH too? It seems that the pH swings alot and that is causing this weird leaf thing.
When growing in coco you need to follow the hydro nutrient uptake chart when adjusting pH, so the optimum range is 5.5-6.0 and also when using 24/0 lights it will bring much more stress to the plant so if they are showing stress symptoms I suggest that you give them ateals that 4hrs of darkness to fasten the healing process of the plant