those leave edges going down looks lik plants trying to conserve water u sure it has enough water do u get runnoff?if so i was think over fed but closer look i believe ur having Phosphous defiect due to ph or unbalanced nutes also raised between viens points to salts as well but that could be time of day also its P for sure second look its used for cell division etc it the new growth showing the worst signs try adding some balanced nute to one plants with 20%run off that one will looklittle better in day