Brown spots on older fan leaves

You can compare your pictures to the examples in the article and that should get ya back on track, specifically check sulfur deficiency

https://futureharvest.com/blogs/articles/how-to-detect-deficiencies-and-toxicities-in-cannabis-plants This will keep ya on track..

You got a bit of sulfur deficiency if you down load grow dr or Google sulfur deficiency you'll see that you have early stage and just need a bit of Epson salt a teaspoon per 2L should do you can do a foliar spray or just add it to the medium your using give them a few cups and go from there, keep a eye on new grow to see if it clears up and keep a eye on the older leaves to see if it gets worse.. it will take a 4 or 5 days to see a difference, good luck! A foliar spray you can apply every couple days for about a week do it just before lights out so you don't get a burn on the leaves...

What feed chart are you using GrowingGrannie? The ones on GH website don't show equal parts in week 2.

Yeah as far as my water goes, it starts out 0-1 PPM. Then after adding MSA, it goes up to about 40-50 PPM. Then after adding Cal-Mag at 2.5 mL/gal it takes it up to around 220-240 PPM. Would mean around 170-200 PPM Cal-Mag.

I agree with gottagrowsometime here but wanted to pop in and tell you that your ratios with the GH Flora series is off and is probably what is causing the deficiency.. so you'll need to correct that before the calimagic can do it's thing. The ratio, at this point in the grow, should be 1/1/1 - in other words, equal parts of Gro, Micro and Bloom... as you transition into flower, you're going to want to change up that ratio to 1part Gro/2parts Micro/3parts Bloom ... and use 1-2tsp Calimagic throughout your grow. Good luck!

Hey pal. I've found also with a few of my fems at this stage showing cal defs. So. I see you are giving a lot. So just to curve this issue head on for a few days you need to drop everything. My tap ppm is 110 so I need to bring mine up to 250ppm I find this early on in veg is more than enough you'll never know your true ppm of your cal by using all that. So water your girl nicely. Leave it dry out. And then apply a 250ppm.cal mag.. so if your water is 125 you need to up it to 250. I use actual cal powder. So I see you using calimagic. That also has other stuff. But it'll do its job. But needs a few cooks out the kitchen to get rolling if you get me. Good luck pal.

Yeah I was thinking it was calcium. Any thoughts on how much I should raise the cal-mag? Maybe to like 4-5 mL per gallon?

Hi there I would also up the calmag 👍 Other then that she’s looking nice and healthy Best of luck 🌱

Looks like you could up the Cal-Mag for the RO water