Rqs stress killer&cheese

I haven 't been taking care of the plants so much this week which has lead to inconvénient consequences. The stress killer looks really bad. And the cheese still has curling down leaves. I realised the water ph is à little high (7 tout 7.1) so I decided to flush it and that s when I realised that the water ph is even higher (7.9). I double checked my ph meter and he is perfectly calibered so I am gonna get solution to control my ph and will take extra care, but I am dreading it s to late. After discussing the issue with the clerk from the growshop nearby, he tells me that more than a ph related problem, this might be a calmag deficiency. So he gave me a new chart for my nutrients schedule. I ll try this for the end of this grow.