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What are the temps? Pics in normal light, including top, bottom, worst leaves and whole plant shots, would help. You almost certainly have at least two problems. If the temps are fine then it's probably Phosphorus & Potassium deficiencies. K def. causes yellowing on leaf margins and downward...

Potassium is commonly the primary flowering nutrient so be sure to get ahold of a good source of K. A strong dose of K when the plants go into flowering can cause flowers to begin forming within a few days. Strong, organic sources of Potassium aren't easy to come by locally. Here's the best...

Geetee is correct about them needing to be transplanted into larger containers.

Curing is a process used to make a smoother, more flavorful smoke and takes some time to do properly. What you want is a way to dry them quickly, not cure them quickly. Small buds can be quick-dried in the microwave and smoked a matter of minutes later. This is one of the best ways to test the...

They aren't getting enough light. The average household fluorescent only supports healthy plant growth a few inches from the bulb. Get a fan blowing lightly on them. The airflow will encourage thicker stems and allow the plants to get closer to the light without heat problems.

GUANOS COME IN THESE FLAVORS: Desert Bat Guano: 8-4-1 Dry-Bar Cave Bat Guano: 3-10-1 Fossilized Seabird Guano: 1-10-1 Pelleted Peruvian Seabird Guano: 10-10-2.5 or 12-12-2.5 Peruvian Seabird Guano: 10-10-2 Original Sea Bird Guano: 13-12-2 Indonesian Bat Guano: 0.5-12-0.2, 0-12-0 or 1-12-0...

Just double check your pH's; the soil & the liquids you give it. Of all the macronutrients, Phosphorus is the most easily locked out by incorrect pH.

Don't flush. Doing so will likely make the problem worse. Flushing is only for toxicities in the substrate or as the last watering before harvest. If there is Ca deficiency, as SCCA mentioned, then a Bone Meal tea will supply the nutrients they need; plenty of both P & Ca. A deficiency is...

It's hard to give a positive diagnosis for that problem. Our first guess would be Phosphorus deficiency.

It's not a virus, it's Phosphorus deficiency. You see how some of the leaf blades have most of the damage on only one side? That's caused by P def. Make sure of your soil pH is correct and feed them a ratio around 3-5-2.

Using quality fertilizers, the only change you should really make is from veg to flowering mixes. The average vegging plant should have a ratio around 5-4-3, while flowering plants will typically need a ratio closer to 3-4-5 and more of it. The plants all like variety and no one fertilizer is...

Bone Meal & High-Phosphorus Guano are the best sources of P imho. Make them into a tea for instant release.

Even using a substrate mix with perfect drainage qualities, you can still overwater by watering too often. You just wouldn't be able to drown the plants in one watering. Don't base your waterings on a time schedule, water them when the top third to half of the substrate dries out and they need...

All clones need relatively high humidity before they root. Don't get their above-ground parts wet, though. You want the only actually wet part of the clone to be where you want roots to grow.

Series vs. Parallel wiring is most often a consideration for audio systems. You don't see alot of series wiring in household circuits because it's usually more dangerous. Parallel wiring is just what people think of as normal wiring- you connect the positive to the building's (the circuit...

Keep an eye on the pod leaves. They aren't visible in the pics but if it's fertilizer burn, they'll be in the worst condition.

That looks like early Phosphorus deficiency. What did you feed them?

You can either neutralize the acid with an alkaline solution or flush the substrate thoroughly and then water/feed with the normal pH.

The way that half of certain leaf blades are deformed is commonly caused by Phosphorus def.

Yes. You can give it extra Potassium. Most plants will respond to getting large amounts of K by preflowering, even during veg. Make sure there are no light leaks at night.