Is that the real color of your plant or is it under a blurple light?
To me it looks like your plant is both hungry for nutes and light, as well as too high in nitrogen. There might be a nutrient lockout in your mix, you need to be careful with cal-mag as it often comes with Nitrogen.
What pH do you have your water at when watering?
How wet is the soil? It looks like you are feeding the plants very little, yet we can see a problem with nutrient uptake. So there is either an excess of minerals in the soil, bad pH, poor microbial life, pest or too much water.
I would bet it is a combination of too much water, too little light and out of range pH with Nitrogen excess.
1) I would bring the light slightly closer to the plant
2) Give a good watering without nutrients at about 6.2 pH to affected plants (if you have it ; add Calcium in a non-nitrogen form to the water, such as Calcium chloride (de-icing salt), if you don't have some it does not matter, but make sure the pH is right)
3) Make sure you have a water runoff, you are looking to clean to medium of excess salts with this watering.
4) You then wait 2-4 days for the first inch of top soil to be dry.
5) From there, feed them at at least 1/2 strength of your nutrients recommended dose (your plants look thin and tiny for 33 days in, they need more light)
The pic of your full plant doesn't look that bad, but that's how I would do if I was using your method to grow and I had the problems you showed in the first two pics (if it doesn't fix itself and happens on more than just a few leaves.)