IMO THOSE DONT NEED FOOD THEY NEED TO BE TRANSPLANTED I HAND THAT ISSIUE AT ONE POINT. TRANSPLANT THEM IN SOME GOOD SOIL AND A LITE WATER TO START YOU SHIULD BE GOOD
I agree , they need to be transplanted, starting to get root bound in that cup. I like using 3gal fabric bags from Amazon and that soil does look kinda dry. I mean you cooould grow longer in that cup, but i like to transplant personally at that point. I also would not use nutrients right now until they bounce back and look hungry, just Ph adjusted water to 6.2-6.5 is sweet spot. Your light is 48" away, seems kinda far unless its mega powerful. I'd keep mine at 24" at that stage of veg, just not full strength. I find a 'cloudy' day sometimes(25%-50% light strength) during veg sometimes can bring depressed plants back. I've had great success at that stage of veg with 24hrs of light for 3 weeks from the beginning, or maybe its time for 18/6 as long as you stay consistent. Keep humidity at 70% .
Just my opinion and we all got em , good or bad lol , happy growing