Peat Pot In Dwc?

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TLDR : everything goes wrong after transferring successful seedlings started in jiffy pots to kratky/DWC.
Hi all, excited to make my first post here. It's been three weeks since I germinated various seeds ( kardamom, cherry tomatoes, spinach) and also some basil cuttings. I am using jiffy pots for the seeds to grow. Now I am confused about the proper transplanting into kratky and DWC systems. I transplanted some of the grown plants without disposing of the pellet and directly putting it into net pots,covering them with clay pebbles. Put them into small buckets to try out kratky. Their growth seems to have stalled however they haven't wilted. Now the cherry tomatoes that sprouted, i tried to remove the pellet while trying not to disturb the roots. Afterwards I put the seedlings into net pots filled with clay pebbles, into a DWC bucket. Next day all wilted and now they are dead. Lastly the basil cutting, it has grown some roots alright, but when transferred into a kratky pot, growth again seemed to have stalled, the leaves started turning yellow with copper spots, root growth has paused.
I might have done everything wrong, just because I was weary of using rockwool. My liquid fertiliser solution is 3.5-3-6.5. I diluted it in water as per instruction, but something about the colour is way off - much darker brownish than what I've seen in videos.
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I am extremely interested in the whole process and it saddens me that I seem to have failed so miserably.
How would you transfer seedlings into grow medium? What if you dont want rockwool?
Peat Pellets To Dwc
Mackeeper license code free. What is the proper size of a seedling when its ready to be transplanted? Could it be that I transplanted them too early?
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Does a jiffy pellet in net pot introduce problems to the liquid solution? If yes, what alternatives are there?
If you made it this far, I really appreciate your time!