Kinda long, sorry & bare with me!

So I have 2 plants going, Great white shark & Wedding cake. They both are in wk 4 of life and had a rough start. I rescued them from a friend who was raided and these were not found during it but had to go so I took them in. A rough 4 hour drive home in the car with them after being manhandled, lol. They were both sitting on deaths doorstep when they made it to my house literally laying flat on the soil in their 1st week of life. I perked them up and got them going again but over the last week my Wedding cake took a turn. Pics below show GWS looking lovely all things considered and the Wedding cake is the small stumpy one. It appears as though over watered but I only water once a week give or take as needed. I check using the lift, sticking half a finger in soil to the side of the plant and even have a moister meter for when I'm in between whether it's needed.
They are in Ocean Forest soil and using Fox Farms for nutes. Temp is average of 80 (best I can get in our crazy whether patterns lately) and humidity averages 40-45. I keep trying to spritz a water bottle in the tent every so often to raise and/or balance humidity but again our weather has been a bitch lately to maintain. One day we will have 80° and the next day will be 50°. Drives me insane! These are in an indoor tent (24×48×60+6) but still fluctuates. :/ I have a Spider Farmer light in there as well. PH kept around 6.

I think that covers it? So now if you stayed this long, what do you suggest I do to perk her back up? A week ago they looked the same and everything done to them has been the same for both so not sure what happened to make WC start looking so shabby. :/ Oh and lights are at 18in above tops