Plants seem ok but yellowing of leaves

Hi,

Got 4 plans at week 5 of flowering, all different strains. They were potted in half "super soil" and half potting mix, since this is what I had at the time. I feed them every other day with Nutri+ nutrients following their recipe: A (6-0-3)+B (1-4-6) flower, carborator (sugars) and bloom boost (0-50-30).

This one is a Super Sour Kush, it has the worst issue:


This is a Jack Herrer, looks decent but you can see it's not 100%:


The other two plants look just fine.

I looked at troubleshooting guides but I'm not sure what's wrong. Thanks!

Looks to be lacking both cal and mag. Luckily for you there is a product just for your needs!

Be careful as most calmag nutrients contain Nitrogen which can throw your N levels off during flower.

Thanks for the tip. I was looking at Green Planet Pro Cal (trying to help the local guys) or otherwise I can get GH CALiMAGic off Amazon. Would that help?