PH problem or Nute burn ? in areoponics

PH 5.6
water temp 72
ppm 750
1 week in flower stage
any idea ?

try lowering the ph like .2 maybe and up the ppm to around 900. My hydro buddy told me this. I grow soil.

Thanks so did you buddy see the leaves ?

see you advising how to sort his ph prob! wondering im a new comer to the game and finnally got a good outdoar soil grow! my water is slightly alkaline here at about 7.5 and i have ph up saloution but no ph down ! can i use vinigar to lower my ph ? do it in the can im using to feed then cap by cap till got btween 55and 65? any help would be great as want these babies to give nice yeild! got canna terra florres and sensibloom plus big bud by an . plus pk13 14 and canna flush for end ! as i say im new have grew few crops but never used all the write nutes and got them as helthy as i have these babies! will post some recent pics soon ! be lucky of for a few fat ones! go steady my weed groing friend!!!ps the ones with the plants in fool flower was my last crop few weeks ago when they were at start of bloom ! the ones from above are of one thats just started its the one with two big colas forming and she is a bigin!!!

pet supply stores tend to sell a ph up or down solution but yea mix it with water and feed, always check ph again b4 feeding.