Out of curiosity...

Why do you have them on a 12/12 light cycle....since birth?

Its amazing they are still standing....

Hell a month old? They ought to have flowers starting pretty soon...

Here is what I would do......

Change the light cycle to 24/0 for 3 weeks.

Lower the lights to as close as you can possibly get them to the top leaves and use a fan to keep the top hot air off the leaves. Get a good fan.

Dont add any nutes or anything for 3 weeks.

Water only with purified or RO water with a pH of 6.8

If they are alive in 2 weeks, chime back in and update pics.

Maybe we can fix these for ya.