What do these leaves tell you??? Heat or Nutes?

Hello everyone,

My first post in a while and I need help. Just made changes in the room and new problems came with.

Please take a look at the pics. The leaves are showing stress of some sort, but I'm not sure if it's heat or nutes. Here are my stats:

Now in week 4 - RO/DWC combo system ("multiflow" style)
PH - 5.8 - 6.3
PPM - ~1200
Green Air CD-12 CO2 (Nat. Gas)
Temps - 70 - 80
Humidity - 45 - 65

Lights: 18/6 @ 1000 watts - 36" above tops

I'll try to get some close ups with better light and I welcome any ideas in the meantime.

Happy 420,

bl4mm0

definitely nutes buddy, because you said your temps stay in the 70-80's and also the affected leaves are in select areas. i dont want to tell you somethig and have it be the wrong thing becaus eim not sure. theres a few things that can cause the tips of your leaves to get cripsy and turn yellow like that. ill read up on it in the meantime or maybe someone else can answer. what are you feeding them?

I switched from FloraNova to Super Nutrients (Super Veg A & B) for this round . I follow the directions to the letter (1200 ppm right now). I'm switching to 12/12 today, so I will be going to Super Bloom (A/B) from here on out; maybe the nutrient change will make a difference??? I waited an extra week in Veg. to try and shake this problem, but I gotta move forward now.

I can't really see how they could be deficient with that high of PPM. The main changes are the C02 which keeps it around 1500ppm during light hours (also adds some heat) and the 1000watts (from 400). Could it be radiant heat??? If it were nutes, I was thinking maybe FE (iron)???

Thanks for the feedback.

looking here: Revised: The Complete Guide To Sick Plants,pH and Pest Troubles - PlanetGanja.com, it looks as if you may be lacking phosphorous, but check it out yourself :jointsmile:

Wow, that 2nd phosphorous picture looks almost identical. I'll bring up the P levels with the bloom regimine. Thanks for the input Reaper.