Spots on upper leaf or two of one plant

[Beachwalker]

How much calmag are you using? What brand? How many ppm? Looks like calcium deficiency to me.

thats the start of a ph imbalance

Im using filtered water, hence the calmag

I believe the three things mentioned above combined are causing the issue

More info about your filtered water and your nutrients would help

 

[NrthrnMichigan]

I find it odd that they would be fine with the light at that distance for weeks and all of the sudden as they get older not want it, but anythings possible

Anybody else have any insight?

EDIT (Ill also add that its pretty tight in there and some of these leaves are under other leaves, far from getting blasted by light)

I used to have similar issues with my dwc until I upped the ph from 5.8 to 6.1. Now days I try to keep my ph between 6.1 to 6.3 and having no more issues. If you look at hydro ph nutrient uptake charts you will find that 5.8 is on the lower side for mag and cal uptake. Just my 2 cents. You are very crowded in that system. I wouldn't wait very long to flower unless you plan on separating your plants into individual buckets.

 

[Ralphie]

How much calmag are you using? What brand? How many ppm? Looks like calcium deficiency to me.

using around 75% recommended dose and using cultured solutions calmag

 

[Ralphie]

thats the start of a ph imbalance

Ph has been steady 5.8,

 

[Ralphie]

I used to have similar issues with my dwc until I upped the ph from 5.8 to 6.1. Now days I try to keep my ph between 6.1 to 6.3 and having no more issues. If you look at hydro ph nutrient uptake charts you will find that 5.8 is on the lower side for mag and cal uptake. Just my 2 cents. You are very crowded in that system. I wouldn't wait very long to flower unless you plan on separating your plants into individual buckets.

Thanks for the info, I will try this, and throw in a bit more cal mag

 

[Ralphie]

I believe the three things mentioned above combined are causing the issue

More info about your filtered water and your nutrients would help

I used plain ro2 water lately, I have a filter in my house and nothing else is being added, but im going to starting to mix with my regular tap now, which is carbon filtered and pretty good water to begin with

Using cultured solutions veg a, veg b, uc roots, calmag

 

[Ralphie]

Updated picture of growth attached, growth seems to be doing just fine and newer leaves don't appear to be effected, is it possible I already remedied the issue? hope so

 

[Ralphie]

I am starting to believe it had something to do with cal mag but not sure if im right or wrong on that, my ph was never off, but i may have been overdoing the VEG A/B by a but, but not too much as my tds were pretty low , here is some recent pics as of yesterday, i am not confident the issue is over,

Adding insult to injury: Last night, i turned on the top water feed for what was supposed to be 10 minutes, but then i forgot to shut it off and did hours worth of activities and the plants looked like CRAP, leaves turned over, burnt tips, i cant believe it happened so quick. This is my first hydro grow, and this is all new to me.. Ive done soil a bunch, but this is a whole different animal.

Anyways, most of these are pictures before i drowned the plants, i didn't take a pic at the very moment and after i turned off the water, they bounced back somewhat, even though some leaves were ruined, I do have some pics of the curled leaves which only occurred AFTER i watered the crap out of them.

I think one issue was that the over watering also amplified and sped up the issues that were already occurring in the nutrient solution , not to mention the actual fact of over watering.

Today i dumped the reservoir and added fresh RO2 water, i then added just UC roots at 2ml/gallon and Ph the water to 6.0 and let the top water feed clean the net pots a bit for maybe 5/10 mins, then i added around 100 PPM of cultured solutions coco cal (CAL MAG) (around 2ml/gallon) and i added another 200 PPM of VEG A and VEG B (around 1.7ML/gallon of each) from cultured solutions, i am right now hovering around 310 PPM with a ph of 6.0, i also threw in a drop of superthrive.

Im hoping that gets them to a happy place, but whatever damage was done is done.

I had planned on going DWC on all of my tents, as i am setting up a few, but times like this make me want to go back to soil, it has been very humbling. even though i think i will get past this and get it all dialed in, i will stick with it.

I will add that even with all this happening, the growth has been nothing short of incredible. Plants nice and tight too.

 

[Ralphie]

And some more pics.. A lot of new growth isn't effected except a few yellowing tips on 2-3 plants, but none of these crazy rust spots and leave issues