We lose around 50% leaves!

You can have right Roots can be damaged from nutrients They not over watered because I see reaction for water they just getting up. But how to fix it? What I suppose to do? Switch for flowering? Try still watering with clear water? Add nutrients again? They growing everyday but I see yellow ends on many leaves..

It might be that with the stress you applied you broke stuff. So that could explain it seeming underwatered as potentially hydrogen transfer is now kinda bottlenecked.

I'm gonna "assume" it's not overwatered though. Coz others suggest it's underwatered. But I dunno about that... Anyway, the other thing I can think of is root issues (why, I wouldn't know).

Well you seem to have nitrogen toxicity. And for some reason, that kinda looks overwatered, rather than underwatered to me.

So in first 5 weeks they gets water everyday always with nutritions.. I think that’s reason of dark leaves and I hope roots are still alive.. from couple days they gets only water every two days..

They look under watered. Have you recently transplanted them to a bigger pot.

What's your nutrient regimen?

Also looks under watered.

I dont know if it's the lighting, but those leaves look VERY dark. Which suggests an nitrogen toxicity. Have you tested runoff EC & PH?

If your growing in coco your ph is set wrong. Needs to be in the 5.5 to 6.0 range for veg. Cheers