Dont worry about him not being up on the walls and vines it will take him some time to adjust to his home, wait a week and he will be up and around on his vines.

They will change colors due to tempureture and stress.

Dust the crickets with calcium 2-3 times a week.

When doing maintenance it dosn't really matter i clean all my reptiles tanks during the day including my whites tree frog tank and my horned frog tank.

Hope this helps!