compostmike said:

Those look better than you're giving yourself credit for, especially for random nursery plants with no strain info. They look pretty tropical/sativa leaning, narrow leaves and long spacing, so I wouldn't expect them to behave like squat indoor hybrids. The color is mostly good and I don't see anything that screams feed burn.

The big thing where you are is the light cycle. In Colombia the plant is basically living under flower-length nights all year once it's mature. So the one that flowered early may not have anything wrong with it, it may just be old enough and getting the signal to bloom. If you're using extra light to keep the others vegging, keep it consistent every night. Weak uneven light can interrupt flowering enough to confuse a plant without really giving it good veg growth. I'd keep the flowering one somewhere it gets real uninterrupted dark, and keep the veg plants on a clear supplemental schedule.

The sack setup is fine if it drains well. I'd mulch the tops though. Compost/coir works best when the moisture stays steady, and sitting exposed on tile those bags can dry on the outside while the inner root zone is still wet. A little straw, leaf litter, or coarse compost on top will buffer that and keep the surface biology from baking off. Half-dose organic feed sounds reasonable while they're this green, I wouldn't push more nitrogen just because they're growing fast.

For the septoria, go easy with the baking soda and castile soap. Spray late in the day, not in direct sun, and don't make it too strong or you'll burn leaves that were only mildly spotted. Remove the worst infected leaves, keep the lowers from staying damp, and open the middle just enough that air can move through. In that climate leaf wetness is probably going to matter more than throwing stronger products at it.

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