I use flora Nova and i buy it on line from the cheapest site www.theindoorgrowstore.com
but before i use to buy it from amazon.com and ebay
but because i have many many problems buying it from individuals i decided to buy it from the indoor grow store
1200 to 1400 ppm wayyyyyyyyyyy too much
that's your problem
in this age the ppm must be in the 700
PH between 5.5 to 6.5
lol you have healthy plants and you expert killing them