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Don't let the healthy plant touch the sick plant, it looks a bit like broad mites, check with a magnifying glass.
I use coco/perlite and I vary the schedule depending on age temperature and stage of growth. From every second day when young to 5 minutes every 8...
The light colour between the veins looks like magnesium deficiency. Is your pH meter accurate ?
With edibles the pot needs to be heated to decarboxylate the THC. There are lots of posts on it just search for decarboxylation.
I also use coco and perlite, the orange colour is caused by tannins in the coco leaching in to the perlite. When I see orange perlite, I know I...
Did you flush the coco with Calcium Nitrate ? Coco peat contains tannins(tannic acid) it tends to lock up some nutrients. Soaking your coco until...
Could be light burn, especially if water condenses on the flowers.
They look all right to me, wait a while and see what happens.
If you keep the pH above 5.6 the plants should be fine. I used to run at 5.6 to 6, but now I run 5.9 to 6.3 and am getting bigger buds. I grow in...
If you cut off the only active shoot, you might have to wait quite some time before the plant activates a new shoot.
Well it's not likely to be a deficiency. For bugs I usually use neem oil, which I apply with a painters touch up gun, you get a really fine mist...
What's your pH?
The leaf damage could be bugs, a lot of them like the new shoots, look closely at the underside of the leaves, a magnifying glass helps. Also the...
Broad mites? When the lights are on look on the underside of the leaf with a magnifying glass for little critters, or their eggs.
For my seedlings I use 150w CMH lights but have used 70w in the past. You can pick them up very cheaply secondhand as ex shop lights, they work...
The little brown marks on the tips of the leaves indicates over fertilizing, hooking leaves is another sign.
I always take more cuttings than I need in case some fail to take, and then like you some get crowded and grow narrow. If they are too spindly I...
I had poor results using generic(Chinese) MH conversion bulbs and tracked the problem down to voltage. The lights were running at 100 volts when...
I'm using daylight and a 400W SON-T to head my seed plants and it has been working well.
They look over watered?