Deficiencies and/or moisture stress?

Shark18

New Member
Hi, right to it, have 12 site DWC w/airstones
(Ph)- 5.5 - 5.8, (PPM)-700-800 in 4x3’ tent temp-74-76*. Water temp 72-75* humidity 60%.(2) Blueberry gum #2 and(2) king tut. The king tut seems ok getting little light green for my liking but the blueberry side by side turning yellow and curling up eventually brown and dying been picking dead off (2) sites empty so possibly light getting to roots? Or moisture stress I was narrowing down to here some pics lmk if can help (these are clones cut from last beautiful crop so Mother’s were not showing any of these signs lmk highly appreciate the help ( PPM should possibly be lower around 500-600 if I’m correct but I can’t seem to lower ppm seems to be commin out my tap at 6-700 am I on somewhat right track or could this all be due to inaccurate meter readings could prob use calibration meters bout 1 year old
( buds pics from last harvest (mothers to these clones) also not that I think matters just wanna kno feed back , because of space I have veg t-5 with dwc then flower room is 12 bucket site ebb and flow w (4) 315 phantom cmh. Wanna know thoughts what should I be doin diff and if I should add a hps with the cmh”s for the flowering in the 6x10’ room thanks
 
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