2 runs ago I got a bit wild with nutes…you know thinking some is good more must be better? Ended up locking them up good and was lucky to get them across the finish line. They were not happy. Switched back to what was working after that (close to what @Papalag and others run with Jacks) and things went back to octopot green and lush.
Too many nutes,
Back to less nutes,
Im nervous im going down the same road dude!
I dont see any burning or anything yet after bumping from 70% to 90% last friday. 
lol
I was running Jacks 20-20-20, adding Canna Rhizo, Canna Boost, CalMag, Canna Zyme, Canna PK 13/14, and I wasn’t nearly as careful with measuring as I should have been. A dash of this, sprinkle of that, oh it looks like it needs some of this and some of that. Extra careless and way too much of everything. Part of learning on my own I guess. I’m on well water though too so that’s a little different than your RO water.
Now I am back to reasonable amounts of nutes (IMO) and things are much happier. Though I did harvest some bud off that run, it was not pretty. I’m a bit embarrassed to even share those pics. Faceslap. 
Was like my first run, lol. Pretty sure they shouldve turned to dust with how much i was feeding them. Lol instead they ate it all and turned into a jungle. Issues did crop up about 4-5wks into flower. But did make it across the finish line!
On the octo website in their manual:
Optimal pH Range
After mixing nutrient solution or fertilizers, test your pH and adjust your pH if needed, to between 5.5 - 6.5, before adding the solution to your reservoir. This is the optimal range for your Octopot Hybrid Grow System.
Maybe ill try 6.4 next fill? 
I keep my ppms low in veg I rarely go above 500. I only start to boost two weeks of transition and then weeks three through five. I’ll bring the ppm up to around 700.
I’ve been experimenting with a little bit higher PPM than I normally do. I’m at about 850 to 1000 week six in bloom. I’m not seeing any effect by this starting week eight I’ll start to decrease the PPM’s.
Fuck cancer
Was trying to do this too in veg (ec was around 1-1.1, ppm 450-500ish), but this persistent deficiency pushed me towards not feeding enough.
Now that ive fed what i think is plenty, and the newer leaves arent showing me the issue is going away, im running out of ideas.
Going to try a foliar of epsom later today. If it helps, i think that means root zone is having problems absorbing mag. Even though roots look good and appear to be thriving in the res.
If that doesnt help… i think im just going to top off with bloom nutes and give her the flip. See what happens. Lol
You need to add Epson salt and cal net to the mix every feed small amount keeps
All deficiency at bay
I have been at the ratios given by jacks for their 321 program. And supplementing with a little extra cal/mag every other week. Seems like something is locking out mag.
That’s why this one is so baffling to me. 
Have you thought about a bigger tent? More octos? More plants? I forgot to ask why the RO water?
Ha i def have been wanting a larger tent for sure! I do have a 2nd octo as well.
After my first run literally turned in a wall to wall jungle and trying to figure out what each plant was needing (2 dif strains), i wanted to try and master one plant at a time. That first run was a bit overwhelming. Lol
I know it leaves me with more risk. if something goes sideways and i lose the plant, im SOL and dont have a 2nd one to fall back on.
The RO water is due to my city having water that ranges from crap, to complete shit. 
1 month after i bought the place, the city sent out a notice that due to maganese levels that exceed epa standards, dont drink or consume it. Not to mention very high levels of iron and rust. 
When they switch wells, use/flush hydrants, or do anything to the water tower? Dark orange rust water for days. Its fuckin gross, and had no idea this was a thing here. If i knew? Prob wouldnt have put an offer in.
Here is an example of the shit water that can happen at anytime without warning. Its been way worse than this too.
adjust the ph on that water and you got free fertilizers. 
The water doesn’t look all that great - but I am not an expert by any stretch of the imagination, lol. The jungle looks nice 
I was looking at someone else’s growlog for CSI Durban at a different forum, and saw this plant on the left:
It reminded me of your Durban - leaf texture looks odd and there’s some light green between the veins. I wonder if the appearance may be partly genetic.
Interesting!
i did look at some other grows of the same strain before i got this one rolling, but didnt think to go and look again. 
i do think the lighter coloring in between the veins is pretty stark though. so maybe im having a slight mag deficiency issue, and genetics are possibly making it look worse than it is?
would certainly explain the funky texture too!
lights come on in about an hour, ill check the leaves for any improvement after the foliar mag session yesterday. im sure i missed some spots underneath, hard to get under there when its turned back into a bush after the last haircut. lol
will also check the res ph to see where its at now. assuming high 6s at this point.
its even worse when that crap happens in the morning… turn on the shower to get ready for work, and looks like dark apple juice.
edit: i guess a positive is if i ever have an iron deficiency… i have water for that. haha…
i keep going back to this website talking about mag deficiency… this image is the closest match ive found so far to what i see in the tent.
article also suggests a flush.
another site says ‘excess potassium or calcium in the soil’ can cause mag deficiency as well. also think a flush would help any excess potassium and/calcium buildup in the soil.
Yall… am seeing some more normal looking upper leaves today! Newer leaves are still showing the problem, but slightly older newer leaves (lol) are filling in with darker green.
Still looking a bit droopy or like… flaccid. Lol. 
Res ph has climbed to 7.1-7.2 as well. Crossing my fingers im not unleashing too much mag at once 
