browning and drying? help? (pics)

sorry pics arnt that great just a phone.. not sure what it is. heres some details about my grow.

indoor tent 6 plants
spraying 1:9 milk/water ratio for pm
using happy frog soil and botanicare lineup
week 2 of flower ends wed..
if i left anything out let me know

what nutes? cal-mag may need to be used..

Nutes?
Temps?
Humidity?
when did you spray (lights on/lights off)?
Without complete info a diagnosis is impossible.