Two Plants, Same Res, Very Different Reactions

Hey,

So I got two plants who are placed in the same res, receive the same treatment, yet are giving me two different results.

One plant is drooping and is getting yellowing as well as dark spotting on some leaves. Other one is not giving me any of those problems.

so here is sprouting at about one week:






8 days later one of the plants is experiencing some drooping, other is growing slower but not drooping:











5 more days and one plant is growing perfectly, other is still experiencing drooping despite having swapped places with the other (rotated lid of reservoir 180 degrees):









another 5 days, drooping continues for one plant and not the other despite several attempts to fix (ph raise, nutrient redution, water reservoir reduction, addition of h2o2), other one still going strong:










Plant that is drooping also having some problems with the leaves (dark tinges on some, yellow leaves on some): in total I would say about 4 leaves are affected, and for each leaf the percentage affected ranges from 1-20% or so :

















Any idea why two plants would give two totally different results when they are in the same res (same ph, same nutrients, same temperature)? Is this a competition issue? I have even swapped their positions multiple times with no change.

From clones or seeds?
Same strains?

Perhaps one is more sensitive to the nutes. It could be the same strain but different mothers.

Both are from seed


One is Female Seeds Pure AK (the one giving problems)


Other is FEMINIZED UFO #1 Reserva Privada OG Kush


Supercropped both these plants today, suggestion was given on another forum (although I couldn't justify that suggestion I tried it anyway).

Here is a better view of some highly damaged leaves that i removed. Dorsal and ventral views are both there, notice how the largely damaged parts are visible from both views. Some affected areas are a shiny bronze colour
Thanks again for everyone's help

From what I've read, different strains from different breeders have different preferred values in terms of nutrient consumption. Some are really nitrogen hungry and others are super sensitive to phosphorous and so on. Perhaps lowering the strength of nutrients you're using and seeing what the results are on both plants might be a good idea?

will give this a try, thanks hsf! Anyother suggestions will also be appreciated.

List your nutes and amount you feed

I use the stealth hydro pre-mixed nutrient packs found @ http://www.stealthhydroponics.com/product.php?xProd=4

Mix in one packet for the 6 gallons res. Just refilled the res today with nutrients at half strength based on HSF's suggestion