Great pictures!

They do change colors from night to day. During the day, they are usually a light green, and depending where in the vivarium they are, they can turn almost white or have a blueish hue under the lighting. At night, they turn a deep dark green to camouflage themselves. Mine have actually turned different colors depending on what plants they are sleeping on also. I'd bump up your night temps a little bit. 68 is getting a bit too chilly for them. I do feed my reds daily, as they tend not to overeat on their own, but you could definitely do every other day.