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Yep, water temp appears to be the problem. 25c =77f Way to warm. As tyke says, go with plugs under a dome. You'll develop a feel for cloning and then you will have greater success with the more advanced techniques such as the bubble cloner.

Cannabis plants are like people, they older they get, the more they smell.

Dry trim vs wet trim.....it think the correct choice all comes down to the rh in your area. Dry trim is better for me when I have low humidity, it dries slower and more thoroughly....but it's a bigger pain in the dick. Chopping early means the terpenes haven't fully developed, which will mean...

No need for bottle water, most likely the slime is from high water temp or light leaks. Keep water temp around 68 and don't submerge the stem, just let the bubbles pop right underneath the cut. Warm water holds very little O2 for those roots....

Too much k indeed. It looks like it's started to lock out Mg. Leaves look brittle, high salinity is possibly causing leaf margin burn. Don't fuck around with ground up banana peels.

Calcium gets bound in coco due to ionic exchange with Na & K. Did your coco include calcium nitrate or any other type of Ca? You probably have some locked up Ca in the coco.

Your fine. Although they look a bit yellow. What's your growing media?

400w 10" away from seedlings is very intense and can damage them. I'm assuming it's the only light you have? I would recommend 2ft. away until they get bigger. This could be your issue, they're exposed to too much light. Seedlings can not utilize this intensity and will only stress them.

That'll work if you can keep it a couple of inches away from the seedlings.

Put the DE on top of the sand.

Yea if you can cut a hole and vent into the wall or ceiling, do it. You won't even need to draw air from outside, with that negative pressure in the room cool fresh air will just come in by itself. It will be possible to open/close the window to tweak your room temp. The humidifier will help...

You mentioned you had poor ventilation, a humidifier in that environment might cause some trouble so if you can fix your ventilation I would say go for it. Moisture stress occurs when when the humidity is too low, the temperature is too high, or transpiration is too rapid... it resembles what...

No problem. I would start fertilizing in a week or so, I personally like House and Garden soil A & B nutrients. You're watering too frequently, go with a deeper watering less often. Maybe 1/2-1 gallon 1-2 times per week, depending on how much it uses. Let it dry out between waterings to promote...

Why the coconut powder as a foliar? Or even aloe for that matter. Plants don't need that much b vitamin. I've used silica supplementation with great success using only soil applications. Potassium silicate dries up into a salt so maybe it drew excessive moisture from your leaves, and moisture...

It looks like old damage, it's doing fine right now....just make sure she gets enough CaMg and correct pH. Your plant looks like an Indica, and indicas typically like a little bit more magnesium.

11 hours of direct sunlight for the seedlings is way too much. They don't have the capacity to utilize that much. Go with a couple hrs direct and the rest shaded, indoor fluorescent, or indirect sunlight. I would recommend vegging indoors, otherwise they will start flowering right away, which...

Sprinkle diatomaceous earth on it. It has no effect on the plant.

Please do not use peroxide it's going to kill the beneficial microbes in your soil. Gnats are not a big deal. Problem solved easily......Use azamax soil drench or diatomaceous earth as Justin said.

The third picture looks a little dry, you might want to replant into bigger containers. They look like they are in coco cups so you can just drop them right in

What would be the benefit of adding dead leaf material to water? All you would get is chlorophyll water, and roots don't uptake chlorophyll. It would need to be composted to provide a benefit.