First DWC Grow need help!

Hi everyone,
just started my first grow. I'm in day 12, growing from seed using rock wool. At the mo my 5 Big Bangs are in 20 litter container. Temp is 22-26 C, Humidity is 35%, EC is 0.9 and pH 6.1! I'm giving them Formulex and Liquid Oxigen at the moment.
I was just wandering since it is my very first grow how do you think my plants are developing? I wonder why my #2 and #5 are lighter green then the rest though are twice as big. I'm assuming they are hungrier then the rest but not sure. I tried to feed them Formulex by GT last week at EC 1.4 but burned #2 a bit so i backed off! And my #3 looks a bit sick. Might this be because i broke couple of small roots during moving them from the propagator to the container?

Sorry about the pics, the#2 and #5 are twice as big as the rest!
Will appreciate any comment! thank you

If you broke roots and they are that young they will go into shock but should recover. You should not be feeding them really anything right now for the first 2 weeks I fed mine tap water that was PH'd.

I then added 1/4 strength nutes below 300 PPM. I slowly work my way up in PPM each week to around 500-600 max during veg but that is just me. Slow & steady is the key to not burns, keep a journal so when you go back with the same strain later you know exactly what they can & can not take.

The above advice is correct you don't need to feed for a while when shes young like that especially not 1.4 i'm not suprised you burned her i have a couple plants in 20litres buckets also and they are on 1.0 EC,4 week veg 2nd week of flower and looking healthy.

As above already said slow and steady.

Looking good, glad to see you have that rockwool covered!!

Like mentioned abouve, slow and steady on the feeds...

Happy farming....