Can't figure out this leaf problem

Looking for advice. Having this strange discoloration in my leaves. I just finished 5th week of veg (18-6):

• Sealed room
• Titan 18 site flow and gro
• 6 1000W Gavitas
• 10' ceilings
• 3 ton mini split
• Co2 generator - 1400 ppm during day only
• 62-65 degree night time / 78-80 degree daytime.
• 50 - 65 relative humidity
• 5.8 pH
• Using well water
• Use CX Hydroponics nutrients per feeding schedule
• Treating for spider mites

Also, I have a second room with Hortilux 1000W lights, not sealed, no co2 generator, same Hydro system and nutes... no leaf problems. Any suggestions would be appreciated.

Here is same room last grow a few weeks into flower

Does anyone have any ideas or did I post incorrectly?

One thing you said you have another room same everything except the co2 generator, possibly your issue ? I have no experience with them.

possible issues ... to much light in veg. Light stress. To much co2.. co2 toxicity. The spider mites not helping things causing stress. What is your nute ppm. Are you feeding a balanced nutrition to your plants. Check you roots are they nice looking or look like sheet. what are your feed times how long how many times a day. Whats nute temp?


Are you feeding ten times a day for an hour each time, with 1900 ppm nutes with 1400 ppm co2 with a 1k light 2 inches off the top of a 1 foot tall plant?

Thanks for the reply. I wondered about the light. I'm running the gavita de lamps at 60% through veg, and they are probably 6' above the canopy. I'm feeding every 4 hours for 30 minutes each time. Water is under 60 degrees and I use a chiller in the summer. Roots don't seem to be growing amazing. I am pumping air into each bucket 24 hrs a day. Nute ppm is around 1200.

Looks like a molybdenum deficiency to me..

I don’t have any experience with hydro. But isn’t 60 below farenheit a bit low?

Says here Molybdenum is locked out a too low of a pH.

http://www.growweedeasy.com/molybdenum-deficiency-cannabis

Hope this helps!

miket0813 said:

Thanks for the reply. I wondered about the light. I'm running the gavita de lamps at 60% through veg, and they are probably 6' above the canopy. I'm feeding every 4 hours for 30 minutes each time. Water is under 60 degrees and I use a chiller in the summer. Roots don't seem to be growing amazing. I am pumping air into each bucket 24 hrs a day. Nute ppm is around 1200.

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try feeding for fifteen minutes instead of thirty, 60 is too cold 70 is where you need to be at, 1200 seems like a bit much for hydro at this stage imho 600-700 ppm seems like a better number for a small hydro plant. get some hydrogaurd to clean up your roots

Is it happening at the top of the plants? There’s a P defenciency in the 2 week old flowering pics.....

First thing you need to do is raise the temps to the high 80s to near 90 in the co2 supplemented tent in order for the plants to benefit from the additional co2.