please help not sure whats going on yellowing leaves

i have the girls going 12/12 from seed using gh flora half strength im in week 2 of flower... all seeds germ the same week but some were stunted and had weird leaves like mutants lol now seems i have some yellowing and some brown spots its not on all the plants.. i am thinking nitrogen def but not sure how to fix it.. i read add some nitrogen but HOW you all say just add some but i am not really sure how and what to get or if i can just add more micro as it has nitrogen PLEASE HELP ME not sure if its nitrogen or cal mag or what i feel so lost

What Strain is it? Bagseed
How Many Plants? 6
Is it in Vegetative or Flowering Stage? flower
If in Vegetative Stage... How Long? 12/12 from seed
If in Flowering Stage... How Long? 12/12 from seed
Indoor or Outdoor? indoor
Soil or Hydro? Hydro
If Hydro, Reservoir size? 18 gal
If Hydro, Reservoir Temperature? 72
If Hydro, what type of Medium? Hydroton
If Hydro, what type of Setup? flood and draim
Size (Wattage) of Light? How Many? 400 hps
Is it Air Cooled? yes
Temperature of Room/Cabinet? 72
RH of Room/Cabinet? 48
PH of Medium or Reservoir? 5.8
Any Pests? bot that i can see
How Often are you Watering? flood 3 times a day
Type and Strength of Fertilizers used? gh flora 1/2 strength
Size or Square Footage of Room? 8x8

I always lose a few of the bottom leaves even in an otherwise healthy plant. I don't worry about it unless it spreads. It could just be that they aren't getting enough light? Alternatively, increase the ppm slightly?

Your plants look like they are nitrogen deficient. Most bloom foods use limited amounts of it, and that seems to be the case in your situation. Get some more nitro in your feed solution and every thing should turn green again.

thanks i will try that i just flushed and res change ill increase my ppm thank for your help

well like i said i really dont know how to get more nitrogen do i just add more nicro as it has nitrogen.... i am so lost as to how to add and how much to add

There are nitrogen supplements like Nitro Boost by H&G (which I use), but a simple fix is to add some grow formula that has a decent amount of nitro in it to your feed solution. That would work also. Good luck

Ha. There's a thread going right now about how to boost your nitrogen...thread title "Urine" says it all really...(if you fancy an organic fix hehe)

I reckon you shouldn't do anything too rash, since the deficiency isn't looking too severe. Upping the ppm very slightly might help, or using a more balanced flowering nutrient mix.

hi every one well its been a battle for sure with the help of jimdamick (rep to you the man) and a feeding change and a few other things mostly just nute change so far.....
here they are after a few days i think look better have a look,,,, i have one that seems to be yellowing all over not sure yet lol if you see the stem in the forth pic it has a huge main stem i wonder if its root bound in the pot.... its kinda all i can think its only that one plant what you think