You water them right? And the excess water coming out of the holes in the bottom of your containers has what ph? And what is the ph of your feeding water?
But to be honest they look great, except that one runt, i would just discard her and focus on those that look great. These are from seeds right?
You are using mostly organics which take a while to work, they work very slowly depending on which ones, some work medium rate.....
if you want to fix this you need to add micronutrients.
Not to mention those plants should be put into pots now, not big ones.... root bound plants can give difficultly in absorbing nutrients.
Are you using RO water? distilled or any water that has hardly any ppm's or micronutrients?
how much promix to FFOF mixture?
How long have they been in this mixture?
The small one is either calcium or potassium, it's too hard to tell, because with those 2 you have to get a close up of the leaf to tell which one it is......and since it's having hard time growing, which it looked like it has been over watered in the past which would explain why it's lagging behind in growth.
That is not a phosphorus problem.
Are these all the same strain?
Right now you do not have a pH problem from what I see right now....
Where does it say don't worry about pH when using organics?
Not to bad looking But IMO i would say PH does matter and you should always know what it is it's the easiest fix and nutes is a little different but check your ph you might be surprised how easy it is to deal with 1 min thats all take the time and do it.
I don't think it's a ph problem. Did you add lime to your soil mix? If you did not then it could be. The lime is perhaps the most important amendment in that soil mix.
You dont need a ph meter if you have the right soil mix, organic soil with EWC and lime will control your ph swings. Anyone that has ever tried feeding with compost or manure teas will tell you that adjusting your ph is pretty pointless because an hour or so after you try it will just go back to the previous ph. The soil mix with the lime and ewc help take up the required nutrients even if the ph is out of wack. When is the last time mother nature used a ph meter on outdoor plants? Organics is almost exactly that.
People that are telling you it's ph probably never have grown in an all organic mix.
Are you adding bene's (beneficial bacteria) to you nute mix? They help your plans to absorb the nutes more efficiently, and are what really allows organic growers to not worry about pH. Look on eBay for "Blue Mountain Organics" SPT (Super Plant Tonic, it's cheap). It has bene's in it and also Blackstrap molasses along with some trace minerals such as Ca. That SPT is a great add for any organic growers mix. Also think about something like Aquashield from Botanicare, it's a compost solution that has bene's in it.
Here is a link to some bene's sold on eBay. This mix of bene's is like AN Piranha, Tarantula, and Voodoo Juice all mixed into one. That AN mix will cost you over $100. The mix being sold on eBay runs $12.95.
Mycorrhizal Fungi + Trichoderma + Beneficial Bacteria
I'm gonna say zinc, but you could be right on with Ca. I also use Alaska and really like it. If you have a complete formula fert that contains zinc I'd try to hit it with a quarter dose of that. BTW did you say you're using the fish meal and molassas? Sounds like a lot of feed for little plants ya know.