There was some logic behind it, however misguided. I first started reading about growing just two days before biting the bullet and ordering all my supplies (about five days before germinating). My baseline early on became the ultra-conservative growweedeasy guides. They recommend a lot of traditional stuff like 'only feed nutrients every other watering' for coco. I thought since I was feeding daily, perhaps I would back off the usual CalMag dose just a little to avoid an accumulation of calcium toward the end of the grow. It would appear it might not accumulate in the substrate to the extent I had anticipated.

I'm about 95% sure this is the problem now. I'm going to do a light late feeding tonight to bolster calcium levels.

Edit: I just re-fed, this time with a hefty dose of CaliMagic. Day 10 is when I decreased from 5 mL to 3 mL.

Yesterday evening, Day 11, was when something just seemed wrong about the color of the older leaves to me (~30 hours after the first reduced CalMag feeding).There's something to seeing it in person, I think, which allowed me to intuit something was up before it became readily apparent in photos. This has been a valuable lesson, and I hope one that won't stunt growth and hurt my final yields too much.
Your going to get a lot of suggestions about how to feed your plants. IMHO it is best to use a vendors entire line ONLY. They spend millions of dollars developing nutrients to work together to achieve the best possible results. It is all about liebig's law of the minimum. When you understand this you will understand why you should not mix-n-match your own. The only exception to this rule is when you have deficiencies (it won't happen often if using nutrients correctly). There are a couple of additives I do like and use: Azos and Mykos are microzae and beneficial fungus, Botanicare HydroGuard protects roots in DWC and Mammoth P in all my grows. Other than this I use a vendors entire line only on their schedule for what I am doing. Grow in coco with coco specific nutrients. As to the strength, the vendors charts are a beginning point and for many strains or phenos it is too strong but not all strains or vendors. So I have a system where I start seeds at 1/4 strength for the first week then 50% for the next and I continue to increase by 10% each week until tip burn is observed then back off 10%. This gets you to where the plant likes it not just blindly following the chart. Adding Cal-Mag to a coco coir grow does not upset the balance of nutrients when you follow a coco coir product feeding schedule. In this visual picture of nutrients out of balance SE is the limiting factor. All of the nutrients that rise above the water line are wasted even to the point of a lock-out.

ScreenHunter_129 Jul. 26 18.56.jpg

Liebig's Barrel.
 
Hey - I have a couple of those brown/rusty spots too. I guess I need some calmag?
 
Hey - I have a couple of those brown/rusty spots too. I guess I need some calmag?

Maybe. You're using soil which should have quite a bit of slow-release calcium in it, but given it's hard to overdose calcium, adding more probably wouldn't hurt. You should post some photos of just the brown/rusty spots.
 
I will post pics of the rusty looking spots next time I take pics thanks
 
Day 13: I almost feel like starting over. I won't, though, because I'm 1) too cheap, 2) don't want to have to say my first grow was a complete failure.

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The spotting worsened over night, particularly on FoSt (first photo). I think that's the extent of the damage, though--I don't think it'll get any worse. The deficiency correction isn't like a shot of penicillin where the patient starts feeling better within the hour, but hopefully by now, the heavily increased CalMag is replenishing the plants and won't affect new growth. I just hope none are stunted, though honestly, maybe the plants being a bit smaller would be a good thing in my 32x32" tent, particularly for a first grow where I'll be dealing with the unwieldy things for the first time. As a fan of microdosing in general, it's not like I'm going to run out of bud if I have any sort of meaningful harvest here. (But do feel free to tell me it's not that bad and might not result in dwarf plants :p)

SC (second photo) has hardly any spotting at all, but the leaves crinkled a little when I was looking under them for mites. Seems they should be more supple. Nonetheless, it's only 2 days younger than WC and, based on leaf development, it looks like it's only 2 days behind in growth.

(Edit: Well that sucks... I didn't realize there was an edit timer here. Now my latest update at the top of the first post is going to be stuck at 7/28. Oh well...)
 
Day 13: I almost feel like starting over. I won't, though, because I'm 1) too cheap, 2) don't want to have to say my first grow was a complete failure.

View attachment 936813 View attachment 936814 View attachment 936815 View attachment 936816

The spotting worsened over night, particularly on FoSt (first photo). I think that's the extent of the damage, though--I don't think it'll get any worse. The deficiency correction isn't like a shot of penicillin where the patient starts feeling better within the hour, but hopefully by now, the heavily increased CalMag is replenishing the plants and won't affect new growth. I just hope none are stunted, though honestly, maybe the plants being a bit smaller would be a good thing in my 32x32" tent, particularly for a first grow where I'll be dealing with the unwieldy things for the first time. As a fan of microdosing in general, it's not like I'm going to run out of bud if I have any sort of meaningful harvest here. (But do feel free to tell me it's not that bad and might not result in dwarf plants :p)

SC (second photo) has hardly any spotting at all, but the leaves crinkled a little when I was looking under them for mites. Seems they should be more supple. Nonetheless, it's only 2 days younger than WC and, based on leaf development, it looks like it's only 2 days behind in growth.

(Edit: Well that sucks... I didn't realize there was an edit timer here. Now my latest update at the top of the first post is going to be stuck at 7/28. Oh well...)
I removed it for you. Let me know if it is ok.
 
Day 13: I almost feel like starting over. I won't, though, because I'm 1) too cheap, 2) don't want to have to say my first grow was a complete failure.

View attachment 936813 View attachment 936814 View attachment 936815 View attachment 936816

The spotting worsened over night, particularly on FoSt (first photo). I think that's the extent of the damage, though--I don't think it'll get any worse. The deficiency correction isn't like a shot of penicillin where the patient starts feeling better within the hour, but hopefully by now, the heavily increased CalMag is replenishing the plants and won't affect new growth. I just hope none are stunted, though honestly, maybe the plants being a bit smaller would be a good thing in my 32x32" tent, particularly for a first grow where I'll be dealing with the unwieldy things for the first time. As a fan of microdosing in general, it's not like I'm going to run out of bud if I have any sort of meaningful harvest here. (But do feel free to tell me it's not that bad and might not result in dwarf plants :p)

SC (second photo) has hardly any spotting at all, but the leaves crinkled a little when I was looking under them for mites. Seems they should be more supple. Nonetheless, it's only 2 days younger than WC and, based on leaf development, it looks like it's only 2 days behind in growth.

(Edit: Well that sucks... I didn't realize there was an edit timer here. Now my latest update at the top of the first post is going to be stuck at 7/28. Oh well...)

Let me be the first to say that you have what seems to be a good looking plant to me, but I am also a first time grower!
 
Dont try to adjust too much early on, they look like they are growing nicely. Are you in coco only? Did you add in any perlite?
Do you mist them?
 
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