Change the bedding whenever it actually starts to smell. . once or twice a year is all I change mine.

The water shoudnt be deeper than they are tall if that makes sence. so they cant drown in it

I would use a red light but I personally dont use a night light I let mine fall into the 70s at night.

1.5 - 2.5 around on the branches is fine.

I have a Exo-Terra 24x24x24 I use for mine. I have a heat light on the back left corner and they climb under it for heat and move away when they wanna cool off. They will also sit on the branches a about 8-10 inches below the light and just hang out.