Looks like rust?/updated with form info.

[Badfinger]

At that stage of growth, I wouldnt be surprised if they were a bit hungry for..something.. But thats a tough call without more info.
Next run, ditch the plastic pots and get some cloth pots and you wont have to worry about over watering anywhere near as much.. If they are showing early signs of deficiency, an easy remedy to that in the future is getting some "build a flower" from buildasoil.com and top dressing with that right before preflower.

Build-A-Flower Top Dress Kit

Build-A-Flower is available again!!. Malibu Compost was delayed in reaching us, causing production delays on the Build-A-Flower, so the recipe has changed. 2 Gallon Bags are delayed and will ship out within 2-3 weeks. Build A Flower Top Dress kit 3 Types of Compost + Added Minerals. Top dress...

buildasoil.com

GL

Actually, my next grow is going to be fabric pots. Thanks for the feedback. This first grow originally started as a patio grow in May, and then cold weather, pests and heavy rains just made it a pain in the butt. So they found themselves in a quickly thrown together closet grow.

 

[Badfinger]

Still have this issue and its spreading, tried cal-mag 5ml watering for a week and as a folier. Upped the nutes. Nothings working. I'm now attempting to research fluoride toxicity from the tap water, but info is scarce on the subject on cannabis plants.. I switched them to bottled spring water, its all I have left to try.

 

[Tom Bombadil]

@Mañ'O'Green should be able to help..

My guess would be you might have waited too long to start feeding... The fox farm trio is supposed to build the nutrient in the soil over time kind of to my understanding.. A plant that size in that amount of soil in early flower might get fussy for certain things. Tough call!

GL

 

[Badfinger]

@Mañ'O'Green should be able to help..

My guess would be you might have waited too long to start feeding... The fox farm trio is supposed to build the nutrient in the soil over time kind of to my understanding.. A plant that size in that amount of soil in early flower might get fussy for certain things. Tough call!

GL

That thought also crossed my mind. I did try feeding the trio early on at 25%, and even then I'd get odd leaf reactions. I think that trio is getting pitched for something else next grow. Even my new bud leaves are popping out looking like this.

 

[Mañ'O'Green]

@Badfinger It looks like you have got the pot out of balance That looks like a P-K lock-out and I am thinking too much Nitrogen and too much calcium. With a starting PH of 9.0 your water must be very alkaline. You need to use a lot of PH down (Phosphoric Acid adds phosphorous to the pot) to get it down to 6.3. This is a lot of phosphorous. The spring water may have you swinging the other way. Mix spring water into your tap water until it is 80 PPM. Stop the Cal-mag. Always feed your nutrients in balance but try to get the N down to the low side. Same with calcium.

Tutorial - A word on Nutrients

The proper use of “salt” based fertilizer to grow Auto Flowering Cannabis. Salts: Natural and man made any chemical compound formed from the reaction of an acid with a base, with all or part of the hydrogen of the acid replaced by a metal or other cation. Learning how to use salt based...

www.autoflower.org

 

[Badfinger]

@Badfinger It looks like you have got the pot out of balance That looks like a P-K lock-out and I am thinking too much Nitrogen and too much calcium. With a starting PH of 9.0 your water must be very alkaline. You need to use a lot of PH down (Phosphoric Acid adds phosphorous to the pot) to get it down to 6.3. This is a lot of phosphorous. The spring water may have you swinging the other way. Mix spring water into your tap water until it is 80 PPM. Stop the Cal-mag. Always feed your nutrients in balance but try to get the N down to the low side. Same with calcium.


View attachment 1344725

Tutorial - A word on Nutrients

The proper use of “salt” based fertilizer to grow Auto Flowering Cannabis. Salts: Natural and man made any chemical compound formed from the reaction of an acid with a base, with all or part of the hydrogen of the acid replaced by a metal or other cation. Learning how to use salt based...

www.autoflower.org

What confuses me, is I always ph everything to 6.5, and my runoff ph's at 6.5.