Help please!?

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Hi guys need some help with my grow.

Problem: See picture
-Medium/grow method: R-DWC
-Feed and supplements used: Dutch Pro Autoflowering nutes.
-Water source: Tap water pH balanced.
-Strain and age: DP Think Different
-Climate: min 19 max 24 Celsius . RH 41%
- Light used: 600 w led
-Additional info: H been affected for last 3 days.before that all was fine.
 

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We need to know the EC/PPM and pH of the solution in the reservoir. What it was and have you adjusted it since? However I would guess your pH is below 6 and feed is most likely a tad too high for this stage.

This is Ca -deficiency. It is very typical symptom at this stage and these are perhaps the most common symptom we see people having in hydroponics. You should make sure there are decent amount of Ca in your reservoir (perhaps have CalMag?) and that your pH is around 6.2 for now to get this problem under control. Ca is best absorbed between pH 6.0 to 6.5 in hydro. Affected areas will not heal and will in fact just look uglier over time but you know you have rid of the problem when you don't see new / more leaves getting affected.
 
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Have enough CM to make 0.2 ec to 0.3 ec impact on the feed. High feed also at this stage can make Ca -uptake difficult for the plant. I would just add dechlorinated water with CM in there. That would help up the pH too.


good luck!
 
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They showed up a little and then spread. No massive PH shifts. Added the CalMag as directed above but I still seem to be having the problem on some of the newer leaves. Cheers guys.
 
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