Since your keeping a tree frog you need to think rain forest canopy. They live up in the trees and rarely like to touch substrate/ground.

Here are some random thoughts on what may help.

Height is a necessity over width in your setup. Branches, big broad leaves, creating a place where things are close enough for your frogs to travel from one item to the next to get to water dish, feeding bowl, and back to perch without ever having to settle on walking across the soil. RETFs are not going to inhale meals like a WTF. Mine perch out on the water dish or on the leaves right above the cricket bowl and some nights only one will be out then the next night the other frog is out. Just try to have the crickets smaller than the distance between the frog eyes so they are easier for your frog to eat.

Gets some pics up so others can suggest possible changes.

You also want to ensure a 60 percent daytime (while lights are on) or slightly higher humidity level. Once the lights are out your humidity will rise since the lights are not burning off the humidity. You can cover part of the screen top with a piece of glass to help the humidity not escape so quickly also. i cover about 50 percent of my open tops and one tank needed 70 percent of the screen covered to keep the humidity up.

You should mist with declorinated tap water or spring water about twice a day and if your drying out too fast maybe more often. If you mist right before the meals are provided it might help with appetite also.

Again, as others suggested, get some pics posted :-)