Can’t quite work out if I’ve got a problem on some of the lower leaves on the cheese plant. You can see them starting to go a lighter shade of green. Perhaps someone can comment? Could it be Mag or N deficiency?
Add more micronutrients to your water or raise your fertiliser dosage. I had a similar problem ec and ph on point but a too soft tap water( that cause deficiency similar to calcium nitrogen def) so I raised the dosage of my fertilizers and I add micronutrients( not cal-mag cause my fert line didn't reccomend it) and my plants recovered very well.