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This could well be root rot. When growing in hydro it pays in my opinion to bite the bullet so to speak and treat your root area with a water conditioner that contains hydrogen peroxide.....regularly. Root rot is probably the biggest enemy you are fighting against with hydro growing. The usual...

The garden soil will probably be holding too much moisture around the root area causing the plants to stress. Cannabis prefers fast draining lighter growing mediums than that type of soil. Also you need to be changing the air in your grow room the same as air outside is always moving in and...

I am assuming that you've either read or watched a vid that says that adding fans will cause thick stems? There are three factors in my thinking that result in thick stems. 1/ The genetics of the plant: If you are growing from seed then you will know toward the end of the flowering cycle...

I dont think soil based nutrients will have that affect on a DWC grow, most are not optimum for hydro, some are too organic and can easily lead to outbreaks of bad bacteria, but you still have to either get the EC, pH or water temps wrong (or a combination of) in order for them to have that...

Also, with no intake and outgoing fans your plants are recirculating air which is also recirculating moisture. Your plants need new air which contains co2, and the moisture that is evaporating from the leaves trucked away from the plants and out of the room.

Until the roots are coming out the bottom of those rockwool cubes they will only need flooding every other day. Once the roots come out then you can up that to once a day. The other point is how are the roots going to grow out the bottom of those cubes?

I suspect it should have stopped growing by now. If it gets any higher, and assuming you cannot raise your light any higher, you can tie the top down a little to lower it, or even move the plant to one side of the light so that the bud goes to the side of the bulb, that will allow light to go...

What is the pH, EC/ppm, air temps, temps of nutrients, what is the nutrients and additives you are using, what are u using to treat the root area for pathogens, what color are the roots, are there any dark areas in the roots, what lights are u using,is your grow room completely light proof...

Is your grow room completely light proof, and what are you feeding them?

Did you treat that bed frame metal mesh before growing the plants through them?

Ok so we have the pH, now just need to know the ppm, air temperature at the plants top, how many times you are feeding a day (assuming its flood and drain), type of air circulation you are using, how many plants you are growing and on how many of them are showing this issue, strain, how old is...

Giving plants as much light as they would receive from the sun is not too much light. What were they in before you transplanted them and were they looking sickly before you did this Was that because you saw them starting to turn sickly? Nothing wrong with those measurements. Tell us a...

The plants are babies being grown on adult food and adult soil conditions. The fact that it is still growing is a testament to how hardy cannabis is and not a sign that the soil is fine. Find some proper seedling mix to put your plants in.

Cannot tell from that pic. Tell us a bit more about your grow. Yunno, the usual information.

What strain are you growing?

Its soil that you would grow adult plants in if you had to, what you need is specialized seedling mix soil. Pop down to your local garden center and buy yourself a small bag.

I found this thread of emense help in this situation. ;) https://www.rollitup.org/newbie-central/10004-how-not-grow-dope-14.html#post1178602

Never go from 300 to 1200 in one jump, like ImTheFireMan and i81two said, increase in incriments until you get to something around that mark. PPMs are just numbers in the end, your eyes should trump that. My eyes are telling me from the pics you posted that the plants are asking for more food...

I've only ever had it once, and never again so cannot tell you about bud damage. I guess the other question is have you sorted out where the source of the thrip is coming from?

You have a couple of choices, firstly you could just leave them alone and no doubt the plant will bounce back, those leaves dont heal, the ends are burnt to a crisp and eventually some of the burnt bits will crumble off. Secondly you could get a sterile blade and gently slice off the burnt...