My poor babies, idk what’s wrong with them.

Hi everyone! I’m afraid my plants are not feeling to well and I’m hoping you guys can help! I’m attaching the most recent pics here. I apologize in advance for the mild purple light in the pictures of my larger plant and one pic of the smaller plants under the light to show the contrast of green color on the new growth vs older leaves. There are two lights in the tent and they’re a pain to turn off (there’s no switch and I gotta reach far back behind the tent to get to the outlet so I had only turned off the light closest to the plant and left the further one on. The larger plant is around 2 weeks into flower and the smaller plants started as clones and just started lst sometime this past week. Ignore the odd directions the branches are faced on the larger plant as we just pushed them/spread them out under the net again. In all of the images you may see a shiny or white spots, ignore those as well as that is from a foliar spray of epsom salt (for what I thought the plants needed). The larger plant just seems to have very bright lime green leaves and looks sad. The smaller plants are suffering from the same but also have these small small small spots on them that are reddish brown. I’m thinking now it’s a cal deficiency but I’m not sure. These plants have had this problem off and on or maybe other problems along the way. The original post can be found here where you can find the pictures from before as well as info about the grow set up. (Soil, fox farm happy frog, LEDs)
Diagnosis?? - update they’re worse
What do you guys think this is? What should I do?

 

Can you please explain how to do this?

 

Just gave it some cal mag last night. Hopefully that will do the trick. We check the ph regularly but I’m going to make sure we recalibrate the tester today just to double check bc it can’t hurt. What is pm/what does it stand for?