Browning and Drying

Greetings,

May someone offer insight to this problem, first this started with 2 plants last round - now it's 4 plants this round. I imagine some sort of deficiency. I have tried using more cal mag and it has not seemed to help the problem.

FF Happy Frog plus the entire FF liquid and soluble line.

Thanks.

Almost looks like phosphorus dif. People need more info plants age temps ph veg/flower feeding shedule.

what is the temperature?