What's wrong with this little one?

[Joli]

Hey everyone!
I was looking after this problem with this plant, but i couldn't find any solution.
She looks like this in the past 3-4 days, she didn't grow any new leaves.
I use metrop nutrients + supethrive for veg, they are in coco soil under 2x 250W CFL grow light.
I burned them a bit with superthrive for the first time a week ago, but they've been flushed correctly.
Every other plant is healthy and beautiful, I only have problem with this little one.
Is this problem caused by genetics?

 

[Bailey]

I'm unsure bro but I'm sure one of the professionals will be along soon

 

[namvet25]

Looks like over feeding to me. Young seedling shouldn't be feed nutes to early or this is what happens.Hold of your nutes for awhile before you feed again.

 

[Ripper]

Looks like over feeding to me. Young seedling shouldn't be feed nutes to early or this is what happens.Hold of your nutes for awhile before you feed again.

I completely agree.. also the flush could have shocked her remember every plant is a little different and they react differently... She should be fine in a bit just give her PH'd water and she will be ok.

 

[Joe383]

Looks like there is moss on top of the soil of the plant next to it. You might also be over watering.

 

[Joe383]

To me it looks like low PH and maybe over fed.

 

[Joli]

Hey everyone again!

Thanks for all the answer, but sadly none of it worked ...
She's growing properly like the others, but I still have the same problem.
They're getting metrop nutes at 5.8-6.2 PH, average 24C˙, 55% humidity, coco coir, and they having a clean PH watering once a week.
They are not overwatered, not overfed, there are no bugs at the growroom.

I don't know what's wrong with her.
Is she'll be okay at flowering? Is this caused by genetics? What should I do?

 

[namvet25]

She really doesn't look that bad except the leaves are a little wrinkly and this might just be a genetic problem.Are you going to put her in a bigger pot?

 

[Joli]

She really doesn't look that bad except the leaves are a little wrinkly and this might just be a genetic problem.Are you going to put her in a bigger pot?

I have a bit problem with free space, I can't put all of them into a bigger pot at the moment.
After veg they'll be in a 25L Air-pot, but I'm afraid they have to hold up in these 4-5L pots until I put them in flowering.(i forgot to mention they are photoperiod plants )
What will be the consequences, if they'll be kept in these smaller pots for 2 more weeks? Someone at the growshop said there won't be any coz of the feeding, but I'm looking forward any answer from any professional about this.

 

[namvet25]

As long as they are photos there shouldn't be any problem keeping them another two weeks but I wouldn't go any longer.