Please help: rust spots, holes in leaves

Roots are looking good!
If it was a soil grow the usual recommendation would be to start with something along the lines of a Cal-Mag product and something that will boost
Same for hydro.
A cal mag product will definitely improve things for the OP (preferably with a 1-0-0 or 0-0-0 NPK). Assuming he isn't using one already. For the K boost, a bit of kelp is a great source, there's a few brands that are hydro compatible.


This is the feeding schedule I've been using

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So you're using the Flora series. Just the basic trio or do you have any of the other products?
Can you tell us how your mixing your nutes? And in what order, include everything please.
Have you been using the ratios in the feed schedule?
 
They look like they are hungry for everything to me, esp K, CaMg & Micros as it is affecting the entire plant, not just tips or lower leaves - brown spots are often a sign of K def, which interacts with CaMg
Maybe drop the pH to 5.6 allow it to drift up to 6.0 and add a drop of H2O2 just to make sure the root zone is clean and well oxygenated
Whatever you do to rectify the problem, the tips will perk up first so that's your indicator as to whether you are improving the plant/rootzone or barking up the wrong tree
Can you describe oh drift in your own words? I keep 5gallon buckets with airstones in them. I grow organic an ph to 5.9-6.2. I cal-mag and ph the water but by the time I water again which is about every three to four days, I have to ph again. What about cal-mag? Does it keep for awhile?
 
There’s a possibility its a Manganese(Mn) deficiency: The young leaves showing interveinal chlorosis followed by necrotic spots..? gradually spread to older leaves. General plant growth slows down or stops altogether. The solution is the same as for iron and zinc deficiency.
Im not sure if you mentioned a flush; that can always help; you probably want a slightly lower pH if this is the problem.
 
My 2 cents/thoughts:

Pick yourself up some cal mag
GH calimagic works great

Cal mag always goes first,
(give it a bit between each additive)
Then add micro
Grow
Bloom

Then PH adjust.

I'd recommend starting around 150PPM of Calimagic (open for debate, but should be an easy/good starting point).

Remember, your adding 150PPM worth of cal mag, so that needs to be taken into account (not to make too strong a solution) with your final PPM

The damaged leaves won't heal, but don't start taking them off yet. At this point it's a chronic deficiency, and will be harder to get ahead of, but not impossible and the cal mag will help improve the plant.

Some other additives to consider: kelp product (RAW or Ocean Magic) and/or Liquid koolbloom. You can get by without those, but need the cal mag.
 
are you saying you're at 1725 ppm ? are you using a ppm meter ?

that's as hot as the sun. h202 shouldn't add ppm, if i subtract the h202 i wind up at 1475 which is still hotter than the hottest run i ever had. 1200 is pretty much a ceiling at the height of flower in most grows.


plants themselves don't look too bad. some twisting and claw i'd expect with heavy nutes. interested to see where this goes.
 
here's a handy generic chart if you are looking for a ballpark figure of where you should be for ppm ..






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you should be somewhere within that range.
 
the GH chart looks a touch hotter than i remember. a common approach in dwc / rdwc is to run 1/2 nutes. i don't think that would work in this case.

you should probably cut back the base nutes. i would shoot for the ppm numbers that are listed by GH. if you add nutrients on top you have to cut the base back to make headroom. re-read @Rexer post on the calmag ...



Remember, your adding 150PPM worth of cal mag, so that needs to be taken into account (not to make too strong a solution) with your final PPM



you can't just add the kelp and calmag on top of the base nutes. you have to make room for them.
also h202 shouldn't raise ppm unless you have some kinda awful product. h2o2 can be simply added.

cut back on your base nutes and /or the amendments.
you have to bring everything you feed in to balance and keep within the target ppm range while doing so.
 
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