kush plants are dying,please help

my kush plants are a few weeks old and ive been struggling the whole way.im new to hydro and i keep my ph in check .i dont have a ppm pen but i ran the same nutes on the last grow and didnt have a problem,the lights are 1- 400 watt hps about 2 feet above the tops and the temps are about 82-85 at high.i dont know what to do and im about to lose them,please help

bump,bump,can anyone spare some time for me please,i would really appreciate the help

can anyone help a hydro newbie out please,when i say newbie i mean this is my second grow with hydro,the first one went good but this one is crap

how is your air circulation? humidity? Do a flush and maybe go easier with the nutes. 85F is MAXIMUM temperature any more is danger zone. I aim for 75F. I you were satisfied with your first grow and nothing has changed but the plants maybe this is not a good strain for you?

i got good air circulation,i wish i could get the temps down a few deg but it is what it is.i already flushed but i was thinking the same thing,this isnt a good strain for me,plus the last grow was from clone so that might make a diffrence as well.ill flush again but do you know what the problem is so i can fix the problem,tanks

oh yeah,the humidity is 30-40%

looks like a ph problem keep it at 5.8. also get appm pen. it is a criticalm piece of equipment for hydro.

flush you system re check you ph and go half str. on neuts makeing sure you include all neuts

i keep the ph at 5.5-6.2,i try to keep it at 5.5-5.8 but it jumps pretty quick.im using the oneness from humboldts,with a tiny bit of cal-mag