Deficiencies or surplus?

Woke up to this guy looking like this what’s going on here

Medium? Temperature? Humidity? Nutrients you're using? pH of the water and water/nutrient solution you're giving the plants? Pot size?

Why is there dead foliage in the pot? That's attractive to pests. Keep things clean.

Why is the pot only half full of medium?

Inner ball was Miracle-Gro repotted to promix (US version has no slow release nutes ) temp hangs around 76-84f humidity 55 because I have some younger girls in there too
Soil ph 6.5 watering with 6.0 it’s an 8 inch clay so just under 2 gals dosed with minute amounts of advanced nutrients 3 part solution 350ppm max