Lockout/Deficiency?

Hey @TheDoctor! I always believe that when the young leaves are growing more yellowish than the others is a overwatering problem. If you are watering them more than 1/4 of the volume of the pot and more than each 2 days I should say that there is the problem. If thats the case, try to water them less and wait 2-3 days to water them again. If that's not your case, just check the PH and add some Mg as @GreenMachine has recommend you. Hope it helped you!

I noticed that you don't have a ph listed on your diary. That makes me think that you have a pH problem. You want to try to keep your pH around 6.5 to 7 in soil. The eggshells you added are mostly made up of calcium but it takes a long time for them to break down and become available to the plant. You can soak eggshells in vinegar for a few weeks to make a water soluble calcium supplement, and as grey_wolf said Epsom salt will provide a quick dose of magnesium. In your case, I would really try to get a cal mag supplement since you need to minerals available quickly and make sure your pH is correct. That should fix your issue pretty quick. Good luck!

Get yourself some growers recharge. It will unlock, locked up nutes

@TheDoctor Are you using a calcium magnesium supplement? it looks like a slight mag deficiency but could be caused from ph related lockout if you can give them some epsom salts ( 2 tablespoons per plant) I'm sure they will perk up again Good luck mate 👍