Everything was going great big leaves, growing nice, , had to try Epsom salt on the soil, not even 30min later two of my plants were drooped all the way over, another one slightly slumped, but one seemed to like, as far as other two, I have splints on them and scrapped out majority of soil with salt and replaced. Will they come back?
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Howdy
Hmmm 
How much Epsom salt did you use ?
Do you have picture of plants.
I also raised lights to about 20"in. Now, or should I leave them low
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Howdy
I would put humidity domes on them .
Spray inside domes a couple of times a day.
Use plastic cups or cut off bottom of soda bottle.
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Thank you kindly sir will update in a few
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No additives or amendments needed during the seedling stage Growmie. @Hashtonbutcher has you covered, mist the inside of the clear solo cup, the seedling will absorb the moisture from the dome, remove this daily to re-mist and for fresh air. Water about a shot or 2 every 3 days around the outside of the main stem a few inches away, this will promote root growth. 
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Seedlings should not be fed anything until the little round leaves fall off. Most soils need no nutrients added for the first few weeks of a plant’s life.
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Man… Learning, that’s crucial info right there, lol, thank you much
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Thank you!
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Anytime Growmie, the 1st 2 weeks above ground are the most difficult. I would also suggest once it’s time for the transplant to remove that peat cup, it’ll create root bound and can stunt the plants growth. I remove the dome and transplant once the leaves are touching the inside, usually around day 14 or so
One more thing should I keep my light schedule on 18/6, entering second week?
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Howdy
Yes I would, little plants need some rest. 
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I run my seedlings 24 hours and switch the light schedule to 18/6 after the transplant. What light and the placement do you have above the sprouts?
All of the above… 
100 watt vivosun started like 5"in. above for week or 8 days, with two 150 watt bulbs catacorner about 15 to 20 in. High
Just raised vivosun this morning to about 20"in.
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Proper lighting placement and intensity plays a huge role in seedling thru bud development Grow Bro. I use the smart phone app called PHOTONE to set my lighting. During the seedling stage I set the DLI around 18-20
What is DLI? daily light intake? And is that app to control RJ 11 splitter
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This will give you a better idea. And this is not a linkable controller but a stand alone way to check lighting intensity. Some use a light meter, I down loaded the app a few years ago when it was free, I think there a small fee now but we’ll worth it