Can amybody tell me what these spots are

Im growing gorilla glue#4 crossed with alaskan thunderfuck. I have 36 plants growing in flow and grow buckets. They are on third week of flower. There on 1500 ppm co2. I run an o3 generator on low. Humidity is almost always right at 50. Temp is usually high 70s to low 80s. 12 plants are on lucas method 55 gallon worth. 12 are on a full general hydro lineup at 40 gallon strength. 12 are in lucas method with advanced nutrient additives at 40 gallon strength. I feed them once an hour for 15 mins. Here are pics of the leaves and the spots im getting.

Also there under 1000 watt hps

Also using r.o. water

It's getting too much iron IMO. Did you recently add molasses? It looks like a toxicity of something but not too bad. Your leaf tips are burnt so proof the nutes is a bit hot. Back off the nutes a bit.

Looks like it could be a slight Cal deficiency. I dont think it would hurt anything to add 2-3ml of cal/mag per gal of water and see if it doesnt stop (if you aren't already). Best of luck!

Yeah i assumed a little hot on nutes, i think im real close on that. The calcium deficency makes sense. The only row im using cali mag on disent really have too much of that issue.

pH?

BrutalBuds76 said:

Yeah i assumed a little hot on nutes, i think im real close on that. The calcium deficency makes sense. The only row im using cali mag on disent really have too much of that issue.

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I had a plant have the exact spots as you have. It only happened when i used molasses. The plant made it fine though.

I think i narrowed it down to using too much h202 when i flush my system

BrutalBuds76 said:

I think i narrowed it down to using too much h202 when i flush my system

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What strength H2o2 and what dosage?

I was using 300 ml of 35% per 55 gallon of water for a 15 min rinse once a week

Now im using 200ml

Look at the back of the leaves with jewelers glass for possible spider mites. They eat from the back side. Easy to treat with Pyrethrin but must catch it early.

cal def.

RetiredGuerilla said:

I had a plant have the exact spots as you have. It only happened when i used molasses. The plant made it fine though.

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He's using hydro lines.. o.p. don't put molasses in your setup..

Check the undersides of your leaves.. look real closely... Look for little bugs the size of this period. . You may have spider mites..

Bug free

Ultra clean enviroment, neem oil in veg, and o3 generator.

BrutalBuds76 said:

Ultra clean enviroment, neem oil in veg, and o3 generator.

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You're using ozone in the grow room? That would explain the spots.

To use ozone for odor control you should have about 30ft of exhaust hose before the air goes outside so the O3 as time to react with the odor molecules. Fine in an exhaust stream but burns the leaves stomata if let loose in the grow space. Does the same shit to your lungs too.

I did the same thing about 17 years ago and the spots drove me nuts looking for bugs etc until I read an article about it in High Times or Cannabis Culture mag.

BrutalBuds76 said:

I think i narrowed it down to using too much h202 when i flush my system

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Impossible for H2O2 to cause spots,unless you pour it on the leaves, and not even then. Save the effort and money by using it for a flush, if you flush at all which is unnecessary in my opinion.
Your leaves are fine, don't sweat it, that is normal.
How big an area do you grow in?
With 32 plants, I hope it is huge.
Good luck